References
R. Baer, Abelian groups which are direct summands of every containing group. Trans. Amer. Math. Soc.46, 800–806 (1940).
C. Faith andY. Utumi, Quasi-injective modules and their endomorphism rings. Arch. Math.15, 166–174 (1964).
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Faith, C., Utumi, Y. Baer modules. Arch. Math 15, 266–270 (1964). https://doi.org/10.1007/BF01589196
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DOI: https://doi.org/10.1007/BF01589196