@article{1138038880,
author = {Chen, Bang-Yen},
title = {Null $2$-type surfaces in $E^3$ are circular cylinders},
journal = {Kodai Math. J.},
volume = {11},
number = {1},
year = {1988},
pages = { 295-299},
language = {en},
url = {http://dml.mathdoc.fr/item/1138038880}
}
Chen, Bang-Yen. Null $2$-type surfaces in $E^3$ are circular cylinders. Kodai Math. J., Tome 11 (1988) no. 1, pp. 295-299. http://gdmltest.u-ga.fr/item/1138038880/