@article{2332, author = {Cunkle, C.H.}, title = {A note on Boolean operations}, journal = {Portugaliae mathematica}, volume = {18}, year = {1959}, pages = {177-179}, zbl = {0111.02402}, mrnumber = {0124248}, language = {en}, url = {http://dml.mathdoc.fr/item/2332} }
Cunkle, C.H. A note on Boolean operations. Portugaliae mathematica, Tome 18 (1959) pp. 177-179. http://gdmltest.u-ga.fr/item/2332/