@article{1077491234, author = {Ward, Morgan}, title = {The algebra of lattice functions}, journal = {Duke Math. J.}, volume = {5}, number = {1}, year = {1939}, pages = { 357-371}, language = {en}, url = {http://dml.mathdoc.fr/item/1077491234} }
Ward, Morgan. The algebra of lattice functions. Duke Math. J., Tome 5 (1939) no. 1, pp. 357-371. http://gdmltest.u-ga.fr/item/1077491234/