@article{GDZPPN00234873X, title = {Boolean Operations on Graphs.}, journal = {Mathematica Scandinavica}, volume = {20}, year = {1967}, pages = {41-51}, zbl = {0152.22801}, url = {http://dml.mathdoc.fr/item/GDZPPN00234873X} }
Harary, Frank; Wilcox, Gordon W. Boolean Operations on Graphs.. Mathematica Scandinavica, Tome 20 (1967) pp. 41-51. http://gdmltest.u-ga.fr/item/GDZPPN00234873X/