@article{CTGDC_1982__23_1_43_0,
     author = {Mitchell, Barry},
     title = {Monoidal structures on graded categories},
     journal = {Cahiers de topologie et g\'eom\'etrie diff\'erentielle},
     pages = {43--45},
     publisher = {Dunod \'editeur, publi\'e avec le concours du CNRS},
     volume = {23},
     number = {1},
     year = {1982},
     mrnumber = {648794},
     zbl = {0493.18003},
     language = {en},
     url = {http://www.numdam.org/item/CTGDC_1982__23_1_43_0/}
}