@article{PORMA_1989__46_1_115652,
     author = {Marques de S\'a, Eduardo},
     title = {On the invariant factors of sums of integral matrices},
     journal = {Portugaliae mathematica},
     pages = {87--95},
     publisher = {mathdoc},
     volume = {46},
     number = {1},
     year = {1989},
     mrnumber = {0996404},
     zbl = {0668.15010},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1989__46_1_115652/}
}