@article{1093890903, author = {Welsh, Paul J.}, title = {On the number of overlapping subsets of a set.}, journal = {Notre Dame J. Formal Logic}, volume = {14}, number = {1}, year = {1973}, pages = { 269-272}, language = {en}, url = {http://dml.mathdoc.fr/item/1093890903} }
Welsh, Paul J. On the number of overlapping subsets of a set.. Notre Dame J. Formal Logic, Tome 14 (1973) no. 1, pp. 269-272. http://gdmltest.u-ga.fr/item/1093890903/