@article{GDZPPN002057549,
title = {Homotopy mod. C of Spaces of Category 2.},
journal = {Commentarii mathematici Helvetici},
volume = {35},
year = {1961},
pages = {9-14},
zbl = {0095.16901},
url = {http://dml.mathdoc.fr/item/GDZPPN002057549}
}
Berstein, Israel. Homotopy mod. C of Spaces of Category 2.. Commentarii mathematici Helvetici, Tome 35 (1961) pp. 9-14. http://gdmltest.u-ga.fr/item/GDZPPN002057549/