@article{MZ_1971__121_171568,
     author = {S.H. Nienhuys-Cheng},
     title = {Weak {Homotopy} {Category} of a {Category} with a {Cotriple.}},
     journal = {Mathematische Zeitschrift},
     pages = {295--304},
     publisher = {mathdoc},
     volume = {121},
     year = {1971},
     zbl = {0211.32703},
     url = {http://geodesic.mathdoc.fr/item/MZ_1971__121_171568/}
}