A generalization of a theorem of F. Richman and C. P. Walker
Rendiconti del Seminario Matematico della Università di Padova, Tome 66 (1982), pp. 43-55. 
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     author = {Be\v{c}v\'a\v{r}, Jind\v{r}ich},
     title = {A generalization of a theorem of {F.} {Richman} and {C.} {P.} {Walker}},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {43--55},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {66},
     year = {1982},
     mrnumber = {664570},
     zbl = {0481.20034},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1982__66__43_0/}
}
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Bečvář, Jindřich. A generalization of a theorem of F. Richman and C. P. Walker. Rendiconti del Seminario Matematico della Università di Padova, Tome 66 (1982), pp. 43-55. http://archive.numdam.org/item/RSMUP_1982__66__43_0/

[1] L. Fuchs, Infinite Abelian groups, I, II, Acad. Press, 1970, 1973. | Zbl

[2] J.M. Irwin - E. A. WALKER, On isotype subgroups of Abelian groups, Bull. Soc. Math. France, 89 (1961), pp. 451-460. | Numdam | MR | Zbl

[3] F.V. Krivonos, Ob N-vysokich podgruppach abelevoj gruppy, Vest. Moskov. Univ. (1975), pp. 58-64. | MR

[4] R.W. Mitchell, An extension of Ulm's theorem, Ph. D. Dissertation, New Mexico State University, May 1964.

[5] A.R. Mitchell - R. W. MITCHELL, Some structure theorems for infinite Abelian p-groups, J. Algebra, 5 (1967), pp. 367-372. | MR | Zbl

[6] F. Richman - C.P. Walker, On a certain purification problem for primary Abelian groups, Bull. Soc. Math. France, 94 (1966), pp. 207-210. | Numdam | MR | Zbl