@article{PORMA_1990__47_4_115730,
     author = {Marques de S\'a, Eduardo},
     title = {Hidden relations for the {Smith} invariants of a matrix sum},
     journal = {Portugaliae mathematica},
     pages = {417--422},
     publisher = {mathdoc},
     volume = {47},
     number = {4},
     year = {1990},
     mrnumber = {1090479},
     zbl = {0715.15004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1990__47_4_115730/}
}