@article{KUMEM_1995_3_a5,
     author = {M. L. Rabelo and K. Tenenblat},
     title = {Toroidal submanifolds of constant non positive curvature},
     journal = {In memoriam N. I. Lobatschevskii},
     pages = {135--159},
     publisher = {mathdoc},
     volume = {3},
     year = {1995},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/KUMEM_1995_3_a5/}
}