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quasi-balanced; almost balanced; Kravchenko classes

References:

[A1] Arnold D.: **Pure subgroups of finite rank completely decomposable groups**. Abelian Group Theory Lecture Notes in Math. 874 Springer-Verlag New York (1982), 1-31. MR 0645913

[A2] Arnold D.: **Finite Rank Torsion-Free Abelian Groups and Rings**. Lecture Notes in Math. 931 Springer-Verlag New York (1982). MR 0665251 | Zbl 0493.20034

[AV] Arnold D., Vinsonhaler C.: **Pure subgroups of finite rank completely decomposable groups $anII$**. Abelian Group Theory Lecture Notes in Math. 1006 Springer-Verlag New York (1983), 97-143. MR 0722614

[B] Butler M.C.R.: **A class of torsion-free abelian groups of finite rank**. Proc. London Math. Soc. 15 (1965), 680-698. MR 0218446 | Zbl 0131.02501

[F] Fuchs L.: **Infinite Abelian Groups**. II Academic Press New York (1973). MR 0349869 | Zbl 0257.20035

[K] Kravchenko A.A.: **Balanced and cobalanced Butler groups**. Math. Notes Acad. Sci. USSR 45 (1989), 369-373. MR 1005459 | Zbl 0695.20032

[NV1] Nongxa L.G., Vinsonhaler C.: **Balanced Butler groups**. J. Algebra, to appear. MR 1378545 | Zbl 0846.20060

[NV2] Nongxa L.G., Vinsonhaler C.: **Balanced representations of partially ordered sets**. to appear.

[V] C. Vinsonhaler: **A survey of balanced Butler groups and representations**. Abelian Groups and Modules Lecture Notes in Pure and Applied Math. 182 Marcel Dekker (1996), 113-122. MR 1415625 | Zbl 0865.20040