@article{3318, author = {Almeida, Jorge and Azevedo, A.}, title = {On regular implicit operations}, journal = {Portugaliae mathematica}, volume = {50}, year = {1993}, pages = {35-61}, zbl = {0802.20049}, mrnumber = {1300585}, language = {en}, url = {http://dml.mathdoc.fr/item/3318} }
Almeida, Jorge; Azevedo, A. On regular implicit operations. Portugaliae mathematica, Tome 50 (1993) pp. 35-61. http://gdmltest.u-ga.fr/item/3318/