no. 4
Characterization of injective envelopes
Cahiers de topologie et géométrie différentielle, Tome 22 (1981) no. 4, pp. 399-406. 
@article{CTGDC_1981__22_4_399_0,
     author = {Porst, Hans-E.},
     title = {Characterization of injective envelopes},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {399--406},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {22},
     number = {4},
     year = {1981},
     mrnumber = {639050},
     zbl = {0473.18010},
     language = {en},
     url = {http://archive.numdam.org/item/CTGDC_1981__22_4_399_0/}
}
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Porst, Hans-E. Characterization of injective envelopes. Cahiers de topologie et géométrie différentielle, Tome 22 (1981) no. 4, pp. 399-406. http://archive.numdam.org/item/CTGDC_1981__22_4_399_0/

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