@article{104915, author = {Ale\v s Pultr}, title = {On the homology theory of discrete spaces}, journal = {Commentationes Mathematicae Universitatis Carolinae}, volume = {003}, year = {1962}, pages = {23-43}, zbl = {0105.16902}, mrnumber = {0159326}, language = {en}, url = {http://dml.mathdoc.fr/item/104915} }
Pultr, Aleš. On the homology theory of discrete spaces. Commentationes Mathematicae Universitatis Carolinae, Tome 003 (1962) pp. 23-43. http://gdmltest.u-ga.fr/item/104915/
Foundations of Algebraic Topology, Princeton Univ. Press, 1962. (1962)