@article{bwmeta1.element.zamlynska-3993c499-000c-4bcf-8d2d-3e477ee67f02,
author = {O. Karwowski},
title = {Vertical lines and points of a surface},
journal = {Annales Polonici Mathematici},
volume = {15},
year = {1964},
pages = {141-168},
zbl = {0139.14804},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.zamlynska-3993c499-000c-4bcf-8d2d-3e477ee67f02}
}
O. Karwowski. Vertical lines and points of a surface. Annales Polonici Mathematici, Tome 15 (1964) pp. 141-168. http://gdmltest.u-ga.fr/item/bwmeta1.element.zamlynska-3993c499-000c-4bcf-8d2d-3e477ee67f02/