The existence of envelopes
Rendiconti del Seminario Matematico della Università di Padova, Tome 90 (1993), pp. 45-51 
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     author = {Enochs, Edgar E. and Jenda, Overtoun M. G. and Xu, Jinzhong},
     title = {The existence of envelopes},
     journal = {Rendiconti del Seminario Matematico della Universit\`a di Padova},
     pages = {45--51},
     year = {1993},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {90},
     mrnumber = {1257131},
     zbl = {0803.16001},
     language = {en},
     url = {https://www.numdam.org/item/RSMUP_1993__90__45_0/}
}
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Enochs, Edgar E.; Jenda, Overtoun M. G.; Xu, Jinzhong. The existence of envelopes. Rendiconti del Seminario Matematico della Università di Padova, Tome 90 (1993), pp. 45-51. https://www.numdam.org/item/RSMUP_1993__90__45_0/

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