@article{1183492105, author = {Bernstein, B. A.}, title = {The dual of a logical expression}, journal = {Bull. Amer. Math. Soc.}, volume = {33}, number = {6}, year = {1927}, pages = { 309-311}, language = {en}, url = {http://dml.mathdoc.fr/item/1183492105} }
Bernstein, B. A. The dual of a logical expression. Bull. Amer. Math. Soc., Tome 33 (1927) no. 6, pp. 309-311. http://gdmltest.u-ga.fr/item/1183492105/