@article{1183494279,
author = {Blumberg, Henry},
title = {On a complete characterization of the set
of points of unbounded grade of an
arbitrary surface},
journal = {Bull. Amer. Math. Soc.},
volume = {36},
number = {11},
year = {1930},
pages = { 655-658},
language = {en},
url = {http://dml.mathdoc.fr/item/1183494279}
}
Blumberg, Henry. On a complete characterization of the set
of points of unbounded grade of an
arbitrary surface. Bull. Amer. Math. Soc., Tome 36 (1930) no. 11, pp. 655-658. http://gdmltest.u-ga.fr/item/1183494279/