@article{2713, author = {Rosenfeld, Azriel}, title = {Chain semigroups}, journal = {Portugaliae mathematica}, volume = {32}, year = {1973}, pages = {155-156}, zbl = {0259.20058}, mrnumber = {0316607}, language = {en}, url = {http://dml.mathdoc.fr/item/2713} }
Rosenfeld, Azriel. Chain semigroups. Portugaliae mathematica, Tome 32 (1973) pp. 155-156. http://gdmltest.u-ga.fr/item/2713/