@article{PORMA_1977__36_1_115302,
     author = {La Rosa, B. de},
     title = {On a refinement in the classification of the nil rings},
     journal = {Portugaliae mathematica},
     pages = {49--60},
     publisher = {mathdoc},
     volume = {36},
     number = {1},
     year = {1977},
     mrnumber = {0535223},
     zbl = {0412.16004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_1977__36_1_115302/}
}