@article{MSH_1969__27__21_0, author = {Lerman, I. C.}, title = {H-classificabilit\'e}, journal = {Math\'ematiques et sciences humaines}, pages = {21--28}, publisher = {Ecole Pratique des hautes \'etudes, Centre de math\'ematique sociale et de statistique}, volume = {27}, year = {1969}, language = {fr}, url = {http://archive.numdam.org/item/MSH_1969__27__21_0/} }