no. 1

A class of rings which are the endomorphism rings of some torsion-free abelian groups
Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 23 (1969) no. 1, pp. 143-153. 
@article{ASNSP_1969_3_23_1_143_0,
     author = {Orsatti, Adalberto},
     title = {A class of rings which are the endomorphism rings of some torsion-free abelian groups},
     journal = {Annali della Scuola Normale Superiore di Pisa - Classe di Scienze},
     pages = {143--153},
     publisher = {Scuola normale superiore},
     volume = {Ser. 3, 23},
     number = {1},
     year = {1969},
     zbl = {0188.08903},
     mrnumber = {242948},
     language = {en},
     url = {http://www.numdam.org/item/ASNSP_1969_3_23_1_143_0/}
}
Orsatti, Adalberto. A class of rings which are the endomorphism rings of some torsion-free abelian groups. Annali della Scuola Normale Superiore di Pisa - Classe di Scienze, Série 3, Tome 23 (1969) no. 1, pp. 143-153. http://www.numdam.org/item/ASNSP_1969_3_23_1_143_0/

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[3] A.L.S. Corner, Endomorphism rings of torsion-free abelian groups. Proc. Internat. Conf. Theory of Groups, Austral. Nat. Univ. Canberra, August 1965, pp. 59-69, 1967, | Zbl 0178.02303

[4] L. Fuchs, Abelian groups, Budapest 1958. | MR 106942 | Zbl 0091.02704

[5] A. Orsatti, Un lemma di immersione per i gruppi abeliani senza elementi di altezza infinita. Rend. Sem. Mat. Univ. Padova XXXVIII (1967) 1-13. | Numdam | MR 220829 | Zbl 0203.03001