@article{05232666,
title = {A nonstandard characterization of regular surfaces.},
journal = {Balkan Journal of Geometry and its Applications (BJGA)},
volume = {12},
year = {2007},
pages = {1-7},
zbl = {1130.26025},
language = {en},
url = {http://dml.mathdoc.fr/item/05232666}
}
Almeida, Ricardo. A nonstandard characterization of regular surfaces.. Balkan Journal of Geometry and its Applications (BJGA), Tome 12 (2007) pp. 1-7. http://gdmltest.u-ga.fr/item/05232666/