Voir la notice de l'article provenant de la source European Digital Mathematics Library
@article{JRAM_1969__0239_0240_150960, author = {M. Maruyama and M. Nagata}, title = {Note on the structure of a ruled surface.}, journal = {Journal f\"ur die reine und angewandte Mathematik}, pages = {68--73}, publisher = {mathdoc}, volume = {0239_0240}, year = {1969}, zbl = {0184.46802}, url = {http://geodesic.mathdoc.fr/item/JRAM_1969__0239_0240_150960/} }
M. Maruyama; M. Nagata. Note on the structure of a ruled surface.. Journal für die reine und angewandte Mathematik, 0239_0240 (1969), pp. 68-73. http://geodesic.mathdoc.fr/item/JRAM_1969__0239_0240_150960/