@article{JRAM_1994__451_153627,
     author = {E. Colombo and Pirola G.P. and E. Previato},
     title = {Density of elliptic solitons.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {161--170},
     publisher = {mathdoc},
     volume = {451},
     year = {1994},
     zbl = {0810.14011},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1994__451_153627/}
}