@article{GDZPPN002409178, title = {Weak Homotopy Category of a Category with a Cotriple.}, journal = {Mathematische Zeitschrift}, volume = {121}, year = {1971}, pages = {295-304}, zbl = {0211.32703}, url = {http://dml.mathdoc.fr/item/GDZPPN002409178} }
Nienhuys-Cheng, S.H. Weak Homotopy Category of a Category with a Cotriple.. Mathematische Zeitschrift, Tome 121 (1971) pp. 295-304. http://gdmltest.u-ga.fr/item/GDZPPN002409178/