Voir la notice de l'article provenant de la source Math-Net.Ru
@article{AL_1963_2_2_a2, author = {A. A. Lyapunov}, title = {Operations on sets}, journal = {Algebra i logika}, pages = {47--56}, publisher = {mathdoc}, volume = {2}, number = {2}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/AL_1963_2_2_a2/} }
A. A. Lyapunov. Operations on sets. Algebra i logika, Tome 2 (1963) no. 2, pp. 47-56. http://geodesic.mathdoc.fr/item/AL_1963_2_2_a2/