@article{PORMA_1967__26_2_115010,
     author = {Yaqub, Adil},
     title = {On the equational interdefinability of certain operations},
     journal = {Portugaliae mathematica},
     pages = {125--131},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1967},
     mrnumber = {0248070},
     zbl = {0183.00901},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1967__26_2_115010/}
}