Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{CMH_1959__33_139164, author = {Israel Bertsein}, title = {Essential and inessential complexes.}, journal = {Commentarii mathematici Helvetici}, pages = {70--80}, publisher = {mathdoc}, volume = {33}, year = {1959}, zbl = {0178.26201}, url = {http://geodesic.mathdoc.fr/item/CMH_1959__33_139164/} }
Israel Bertsein. Essential and inessential complexes.. Commentarii mathematici Helvetici, Tome 33 (1959), pp. 70-80. http://geodesic.mathdoc.fr/item/CMH_1959__33_139164/