@article{MZM_1977_21_4_a13,
     author = {V. A. Smirnov},
     title = {Functor $D$ and strong homotopy},
     journal = {Matemati\v{c}eskie zametki},
     pages = {557--564},
     year = {1977},
     volume = {21},
     number = {4},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1977_21_4_a13/}
}