On direct decompositions of torsion-free abelian groups of finite rank
Rendiconti del Seminario Matematico della Università di Padova, Tome 44 (1970), pp. 175-183 
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     author = {Fuchs, L. and Loonstra, F.},
     title = {On direct decompositions of torsion-free abelian groups of finite rank},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {175--183},
     year = {1970},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {44},
     mrnumber = {299675},
     zbl = {0242.20060},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1970__44__175_0/}
}
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Fuchs, L.; Loonstra, F. On direct decompositions of torsion-free abelian groups of finite rank. Rendiconti del Seminario Matematico della Università di Padova, Tome 44 (1970), pp. 175-183. https://www.numdam.org/item/RSMUP_1970__44__175_0/

[1] Corner, A.L.S.: A note on rank and direct decompositions of torsion-free abelian groups, Proc. Cambr. Phil. Soc. 57 (1961), 230-233. | Zbl

[2] Fuchs, L.: Abelian Groups, Budapest, 1958. | Zbl

[3] Fuchs, L.: Recent results and problems on abelian groups, Topics in Abelian Groups, Chicago, 1963, 9-40.

[4] Jónsson, B.: On direct decompositions of torsion-free abelian groups, Math. Scand. 5 (1957), 230-235. | Zbl

[5] Kaplansky, I.: Infinite Abelian Groups, Ann Arbor, 1954. | Zbl