@article{PORMA_1990__47_4_115729,
     author = {Serra Alves, Carlos},
     title = {Ma and lattice partitions},
     journal = {Portugaliae mathematica},
     pages = {411--416},
     publisher = {mathdoc},
     volume = {47},
     number = {4},
     year = {1990},
     mrnumber = {1090478},
     zbl = {0719.03024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1990__47_4_115729/}
}