@article{CTGDC_1974__15_4_419_0,
     author = {Wischnewsky, Manfred Bernd},
     title = {Aspects of categorical algebra in initialstructure categories},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {419--444},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {15},
     number = {4},
     year = {1974},
     mrnumber = {382389},
     zbl = {0324.18002},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1974__15_4_419_0/}
}