@article{MSH_1989__105__27_0, author = {Frey, Louis}, title = {Besan\c{c}on : la porte noire. {Carr\'es} et diagonales}, journal = {Math\'ematiques informatique et sciences humaines}, pages = {27--62}, publisher = {Ecole des hautes-\'etudes en sciences sociales}, volume = {105}, year = {1989}, language = {fr}, url = {http://archive.numdam.org/item/MSH_1989__105__27_0/} }