@misc{CMUC_1967_8_1_a13,
     title = {Category information centre},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {173--174},
     year = {1967},
     volume = {8},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1967_8_1_a13/}
}