On subfunctors of the identity
Rendiconti del Seminario Matematico della Università di Padova, Tome 76 (1986), pp. 89-98 
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     author = {Dimitri\'c, Radoslav},
     title = {On subfunctors of the identity},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
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     publisher = {Seminario Matematico of the University of Padua},
     volume = {76},
     mrnumber = {881562},
     zbl = {0634.20025},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1986__76__89_0/}
}
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Dimitrić, Radoslav. On subfunctors of the identity. Rendiconti del Seminario Matematico della Università di Padova, Tome 76 (1986), pp. 89-98. https://www.numdam.org/item/RSMUP_1986__76__89_0/

[1] R. Dimitri, Relativity in Abelian Groups, 1980 (Serbocroatian), MS Thesis, University of Beograd.

[2] L. Fuchs, Infinite Abelian Groups, Vol. I, Academic Press, New York and London, 1970. | Zbl | MR

[3] R. Nunke, Purity and subfunctors of the identity, Topics in Abelian Groups, Chicago (1963), pp. 121-171. | MR

[4] B. Stenström, Rings and Modules of Quotients, Springer-Verlag, Berlin- Heidelberg - New York, 1971; LNM 237. | Zbl | MR