@article{00702465,
title = {Transnormal graph surfaces.},
journal = {Beitr\"age zur Algebra und Geometrie},
volume = {35},
year = {1994},
pages = {141-145},
zbl = {0804.53084},
language = {en},
url = {http://dml.mathdoc.fr/item/00702465}
}
d'Azevedo Breda, A.M.; Craveiro de Carvalho, Francisco José. Transnormal graph surfaces.. Beiträge zur Algebra und Geometrie, Tome 35 (1994) pp. 141-145. http://gdmltest.u-ga.fr/item/00702465/