[1] Endomorphism Rings and A-Projective Torsion-Free Abelian
Groups; Abelian Group Theory, Proceedings Honolulu 1982/83;
Springer Lecture Notes in Mathematics 1006; Springer Verlag;
Berlin, New York, Heidelberg (1983); 209 - 227.

[2] with Toerner, G.; Group Rings and Generalized Valuations;
Communications in Algebra 12 (18) (1984); 2243 - 2272.

[3] A-Projective Groups of Large Cardinality; Abelian Group Theory
and Modules; Proceedings Udine 1984; CISM Courses and Lectures
287; Springer Verlag; Wien, New York (1984); 233 - 243.

[4] Chain Conditions in Endomorphism Rings; Rocky Mountain Journal
of Mathematics 91 (1985); 95 - 110.

[5] A Note on Locally A-Projective Groups; Pacific Journal of
Mathematics 120 (1985); 1 - 17.

[6] Bewertete p-Gruppen und ein Satz von Szele; Journal of Algebra
97 (1985);   201 - 220.

[7] Baer's Lemma and Fuchs' Problem 84a; Transactions of the
American Mathematical Society 293 (1986); 565 - 582.

[8] Products of Slender Abelian Groups; Abelian Group Theory,
Proceedings Oberwolfach 1985; Gordon and Breach; London (1987);
259 - 274.

[9] Abelsche Gruppen mit A-balanzierten, A-projektiven
Aufloesungen; Hablitationsschrift; Universitaet Duisburg (1987).

[10] with Hill, P.; Butler Groups of Infinite Rank and Axiom III;
Czechoslovak Journal of Mathematics 37 (112)(1987); 293 - 309.

[11] Abelian Groups with Self-Injective Endomorphism Rings;
Communications in Algebra 15 (12)(1987); 2451 -2471.

[12] Faithful Abelian Groups of Infinite Rank; Proceedings of the
American Mathematical Society 103 (1988); 21 - 26.

[13] The Structure of Generalized Rank 1 Groups; Houston Journal
of Mathematics 14 (1988); 305 - 317.

[14] with Hill, P.; Separable Vector Groups; Contemporary
Mathematics 87 (1989); 155 - 160.

[15] Abelian Groups, A, such that the Category of A-Solvable
Groups is Preabelian; Contemporary Mathematics 87 (1989); 117 -
131.

[16] with Goeters, H.P.; A Dual to Baer's Lemma; Proceedings of
the American Mathematical Society 105 (1989); 817 - 826.

[17] Endomorphism Rings and a Generalization of Torsion-Freeness
and Purity; Communications in Algebra 17 (5)(1989); 1101 - 1135.

[18] A-Reflexive Abelian Groups; Houston Journal of Mathematics 15
(1989); 459 - 480.

[19] On Direct Summands of A-Separable Abelian Groups; Forum
Mathematicum 2 (1990); 103 - 117.

[20] Endomorphism Rings of Faithfully Flat Abelian Groups;
Resultate der Mathematik 17 (1990); 179 - 201.

[21] Locally A-Projective Abelian Groups and Generalizations;
Pacific Journal of Mathematics 141 (1990); 209 - 228.

[22] On the Quasi-Splitting of Exact Sequences; Journal of Algebra
144 (1991); 344 - 358.

[23] with Hausen, J.; Modules with the Quasi-Summand-Intersection
Property; Bulletin of the Australian Mathematical Society 44
(1991); 189 - 201.

[24] Extension Functors on the Category of A-Solvable Abelian
Groups; Czechoslovak Journal of Mathematics 41(116) (1991); 685 -
694.

[25] Quasi-Decompositions of Abelian Groups and Baer's Lemma;
Rocky Mountain Journal of Mathematics 22 (4)(1992); 1227 - 1241.

[26] Endomorphism Rings, Tensor products, and Fuchs' Problem 47;
Warfield Memorial Volume; Contemporary Mathematics 130(1992); 17 -
31.

[27] with Faticoni, T.; Abelian Groups Flat as Modules over Their
Endomorphism Ring; Communications in Algebra 21(10)(1993); 3403 -
3423.

[28] with Goeters, H.P., and Megibben, C.; Zero-One-Matrices and
Applications to Abelian Groups; Ren. Univ. Padova 90 (1993); 17 -
24.

[29] Abelian Groups with Semi-Simple Artinian Quasi-Endomorphism
Rings; Rocky Mountain Journal of Mathematics 24 (1994); 853 - 866.

[30] with Faticoni, T. and Goeters, H.P.; Coflat Abelian Groups;
Czechoslovak Journal of Mathematics 44(119)(1994); 431 - 442.

[31] The Construction of A-Solvable Abelian Groups; Czechoslovak
Journal of Mathematics 44(119)(1994); 413 - 430.

[32] with Goeters, H.P.; Pure Subgroups of A-Projective Abelian
Groups; Acta Mathematica Hungarica 65(3)(1994); 217 - 227.

[33] with Goeters, H.P. and Wickless, W.; Mixed Abelian Groups
Flat as Modules over Their Endomorphism Ring; Rocky Mountain
Journal of Mathematics 25 (1995); 569 - 590.

[34] with Goeters, H.P.; Almost Flat Abelian Groups; Rocky
Mountain Journal of Mathematics 25 (1995); 827 - 842.

[35] with Hausen, J.; Non-Singular Modules and R-Homogeneous Maps;
Proceedings American Math. Soc. 123 (1995); 2381 - 2389.

[36] with Goeters, H.P.; Flatness and the Ring of
Quasi-Endomorphisms; Questiones Mathematicae 19 (1996); 379 - 396.

[37] with Facchini, A.; Mittag-Leffler Modules over Non-Singular
Rings; Ren. Mat. Univ. di Padova 95 (1996); 175 - 188.

[38] with Hausen, J.; Mixed Abelian Groups and the Summand
Intersection Property; Proceedings of the Colorado Conference on
Modules and Abelian Groups (1996); 123 - 132.

[39] with Goeters, H.P.; A Note on Fuchs' problem 34; Proc. Amer.
Math. Soc. 124 (1996); 1319 - 1328.

[40] with Faticoni, T., Goeters, H.P., and Wickless, W.;
Subalgebras of Rational Matrix Algebras; Acta Mathematica
Hungarica 74 (1997); 1 - 6.

[41] Mixed Abelian Groups with Artinian Quasi-Endomorphism Ring;
Comm. in Algebra 25(11) (1997); 3497 - 3512.

[42] with Jeong, Jong-Woo; Homomorphisms between A-Projective
Groups and Left Kasch-Rings; Czechoslovak Journal of Mathematics
48(123) (1998); 31 - 43.

[43] with Toerner, G.; Valuations and Group Algebras; Ren. Sem.
Math, Univ. Padova 100 (1998); 68 - 70.

[44] with Goeters, H.P.; Butler Theory over Murley Groups; Journal
of Algebra 200 (1998); 118 - 133.

[45] with Goeters, H.P.; Strong S-groups; Colloquium Mathematicum
80 (1999); 97  - 105.

[46] with Giovannitti, A. and Goeters, H.P; Separability
Conditions for Vector R-Modules; Proceedings of the Dublin
Conference on Abelian Groups and Modules; Trends in Mathematics
(1999); 211 - 223.

[47] Finite Extensions of A-Solvable Abelian Groups;  J. Pure
Appl. Algebra 158 (2001), no. 1, 1 - 14.

[48] A-Projective Resolutions and an Azumaya Theorem for a Class
of Mixed Abelian Groups; Czechoslovak Math. J. 51(126) (2001), no.
1, 73 - 93.

[49] Abelian Groups with Self-Injective Quasi-Endomorphism Ring;
Rocky Mountain J. Math. 32 (2002), no. 1, 1 - 23.

[50] Modules with Morita-Equivalent Endomorphism Rings; Houston J.
Math.  28 (2002), no. 4, 665 - 681.

[51] with Giovannitti, A. and Goeters, H.P.; Pure Submodules and
Torsion-Free Images of Completely Decomposable Torsion-Free
Modules; Communication of Algebra 30(2002); 4629 - 4640.

[52] with Giovannitti, A. and Goeters, H.P.; A class of
torsion-free abelian groups characterized by the ranks of their
socles. Czechoslovak Math. J. 52(127)  (2002), no. 2, 319 - 327.

[53] Fuchs' Problem 34 for Mixed Abelian Groups; Proc. Amer. Math.
Soc. 131 (2003), no. 4, 1021 - 1029.

[54] with Wickless, W.; Mixed faithful Abelian groups; Venice
2002, Marcel Dekker (2003); 13 - 26.

[55] with Wickless, W.; Homological Properties of Quotient
Divisible Abelian Groups; Comm. in Algebra 32 (2004); 2407 - 2424.

[56] with Dauns, J., and Fuchs, L.; Torsion-Freeness and
Non-Singularity over Right p.p-Rings; Journal of Algebra
285(2005); 98 - 119.

[57] with Breaz, S., and Wickless, W.;  The finite quasi-Baer
property; Journal of Algebra 293(2005); 1 - 16.

[58] A note on finitely A-presented Abelian groups; Comm. Algebra
34 (2006), no. 8, 2931 - 2940.

[59] with Breaz, S., and Wickless, W.; Generalized Endoprimal
Abelian Groups;  J. Algebra Appl. 5 (2006); 1 - 17.

[60] with Goeters, H.P.; Generalizing Warfield's Hom and Tensor
Relations; Abelian Groups, Rings. Modules and Homological Algebra;
1 - 14.

[61] with Jan Trlifaj; Cotilting classes of torsion-free modules,;
Journal of Algebra and its Applications 5 (2006); 1 - 17.

[62] Essential submodules of Q(R), accepted for publication in the
Houston Journal.

[63] with Breaz, S., Vinsonhaler, C., and Wickless, W.;
Cancellation Properties for Quotient Divisible Groups; accepted
for publication in the Journal of Algebra.

[64] with Breaz, S., and Wickless, W.; Finitely A-cogenerated
abelian groups; accepted for publication in the Houston Journal of
Mathematics.

[65] with Breaz, S., and Wickless, W.; Purity and Self-Small
Groups; accepted for publication in the Communication in Algebra.

[66] Finitely Presented Modules over Right Non-Singular Rings;
accepted for publication in Rend. Sem. Math. Padova.

[67] Reflexive Modules over Non-Commutative Rings, submitted
Corner Memorial Volume.

[68] with Breaz, S., and Wickless, W; S and S+ Groups, to be
submitted

[69] with Breaz, S., and Wickless, W;.Self-cancellation of mixed
group; to be submitted.

[70] Quasi-Isomorphism and Non-Singular Modules, to be submitted.