@article{PORMA_1987__44_3_115591,
     author = {Ramalho, Margarita and Sequeira, Margarida},
     title = {On generalized {MS-Algebras}},
     journal = {Portugaliae mathematica},
     pages = {315--328},
     publisher = {mathdoc},
     volume = {44},
     number = {3},
     year = {1987},
     mrnumber = {0911844},
     zbl = {0631.06006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1987__44_3_115591/}
}