Voir la notice de l'article provenant de la source Math-Net.Ru
@article{MMO_1962_11_a1, author = {A. H. Livshits}, title = {Direct decompositions of idempotents in semigroups}, journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva}, pages = {37--98}, publisher = {mathdoc}, volume = {11}, year = {1962}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/MMO_1962_11_a1/} }
A. H. Livshits. Direct decompositions of idempotents in semigroups. Trudy Moskovskogo matematičeskogo obŝestva, Trudy Moskovskogo Matematicheskogo Obshchestva, Tome 11 (1962), pp. 37-98. http://geodesic.mathdoc.fr/item/MMO_1962_11_a1/