@article{2365,
author = {Hu, Sze-Tsen},
title = {An axiomatic approach to homotopy theory without using the relative groups},
journal = {Portugaliae mathematica},
volume = {20},
year = {1961},
pages = {95-103},
zbl = {0096.37503},
mrnumber = {0131273},
language = {en},
url = {http://dml.mathdoc.fr/item/2365}
}
Hu, Sze-Tsen. An axiomatic approach to homotopy theory without using the relative groups. Portugaliae mathematica, Tome 20 (1961) pp. 95-103. http://gdmltest.u-ga.fr/item/2365/