[AEJO’00] Aldrich, S. T., Enochs, E., Jenda, O. M. G., Oyonarte, L.: Envelopes and covers by modules of finite injective and projective dimension. Preprint, Journal of Algebra (2000). MR 1848954

[ATT’00] Angeleri Hügel, L., Tonolo, A., Trlifaj, J.: Tilting preenvelopes and cotilting precovers. Preprint, Algebras and Representation Theory 3 (2000).

[AR’91] Auslander, M., Reiten, I.: Applications of contravariantly finite subcategories. Adv. Math. 86 (1991), 111–152. MR 1097029 | Zbl 0774.16006

[B’62] Bass, H.: The Morita Theorems. Univ. Oregon Press, Eugene 1962.

[Be’91] Benson, D. J.: Representations and Cohomology I. Cambridge Univ. Press, Cambridge 1991. MR 1110581 | Zbl 0718.20001

[BGP’73] Berstein, I. N., Gelfand, I. M., Ponomarev, V. A.: Coxeter functors and Gabriel’s theorem. Uspechi Matem. Nauk 28 (1973). MR 0393065

[BEE’00] Bican, L., El Bashir, R., Enochs, E.: All modules have flat covers. Preprint, Bull. London Math. Soc. (2000). MR 1832549

[Co’95] Coutinho, S. C.: A Primer of Algebraic D-modules. Cambridge Univ. Press, Cambridge 1995. MR 1356713

[Cr’92] Crawley-Boevey, W.: Modules of finite length over their endomorphism rings. In “Representations of algebras”, London Math. Soc. Lecture Notes 168, Cambridge Univ. Press, Cambridge 1992, 127–184. MR 1211479 | Zbl 0805.16028

[D’74] Dixmier, J.: Algèbres Enveloppantes. Gauthier-Villars, Paris 1974. MR 0498737 | Zbl 0308.17007

[E’95] Eklof, P. C.: Classification and non-classification results for abelian groups. In: “Abelian Groups and Modules”. Kluwer, Boston 1995, 135–143. MR 1378194 | Zbl 0847.20050

[EM’90] Eklof, P. C., Mekler, A. H.: Almost Free Modules. North-Holland, New York 1990. MR 1055083 | Zbl 0718.20027

[ET’00] Eklof, P. C., Trlifaj, J.: How to make Ext vanish. Preprint, Bull. London Math. Soc. (2000). MR 1798574

[ET’01] Eklof, P. C., Trlifaj, J.: Covers induced by Ext. Preprint, Journal of Algebra (2000). MR 1778163 | Zbl 0981.16010

[En’63] Enochs, E.: Torsion free covering modules. Proc. Amer. Math. Soc. 14 (1963), 884–889. MR 0168617 | Zbl 0116.26003

[EO’00] Enochs, E., Oyonarte, L.: Flat covers and cotorsion envelopes of sheaves. Preprint, Journal of Pure Appl. Algebra (2000). MR 1879949

[FS’85] Fuchs, L., Salce, L.: Modules over Valuation Domains. M. Dekker, New York 1985. MR 0786121 | Zbl 0578.13004

[GS’00] Göbel, R., Shelah, S.: Cotorsion theories and splitters. Preprint, Trans. Amer Math. Soc. (2000). MR 1661246

[HR’82] Happel, D., Ringel, C. M.: Tilted algebras. Trans. Amer. Math. Soc. 274 (1982), 399–443. MR 0675063 | Zbl 0503.16024

[P’00] Peterfalvi, T.: Character Theory for the Odd Order Theorem. London Math. Soc. Lecture Notes Vol. 272. Cambridge Univ. Press, Cambridge 2000. MR 1747393 | Zbl 0940.20001

[S’79] Salce, L.: Cotorsion theories for abelian groups. Symposia Math. XXIII (1979), 11–32. MR 0565595 | Zbl 0426.20044

[T’96] Trlifaj, J.: Whitehead test modules. Trans. Amer. Math. Soc. 348 (1996), 1521–1554. MR 1322958 | Zbl 0865.16006

[W’31] Waerden, B. L. van der: Moderne Algebra. Unter Benutzung von Vorlesungen von E. Artin und E. Noether. Springer, Berlin 1931.

[Wa’69] Warfield, R.: Purity and algebraic compactness for modules. Pacific J. Math. 28 (1969), 699–719. MR 0242885 | Zbl 0172.04801

[We’94] Weibel, C.: An Introduction to Homological Algebra. Cambridge Univ. Press, Cambridge 1994. MR 1269324 | Zbl 0797.18001

[X’95] Xu, J.: The existence of flat covers over noetherian rings of finite Krull dimension. Proc. Amer. Math. Soc. 123 (1995), 27–32. MR 1242111 | Zbl 0840.16004

[X’96] Xu, J.: Flat Covers of Modules. Lecture Notes in Mathematics No. 1634. Springer, New York 1996. MR 1438789