Chains of free modules and construction of x-free modules
Rendiconti del Seminario Matematico della Università di Padova, Tome 77 (1987), pp. 161-176. 
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     author = {Dimitri\'c, Radoslav},
     title = {Chains of free modules and construction of $x$-free modules},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {161--176},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {77},
     year = {1987},
     mrnumber = {904618},
     zbl = {0629.13006},
     language = {en},
     url = {http://www.numdam.org/item/RSMUP_1987__77__161_0/}
}
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Dimitrić, Radoslav. Chains of free modules and construction of $x$-free modules. Rendiconti del Seminario Matematico della Università di Padova, Tome 77 (1987), pp. 161-176. http://www.numdam.org/item/RSMUP_1987__77__161_0/

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