@article{RSMUP_1993__90__45_0,
     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},
     publisher = {Seminario Matematico of the University of Padua},
     volume = {90},
     year = {1993},
     mrnumber = {1257131},
     zbl = {0803.16001},
     language = {en},
     url = {http://archive.numdam.org/item/RSMUP_1993__90__45_0/}
}