@article{GDZPPN002182106,
title = {Characteristic and order of conically differentiable points.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {222},
year = {1966},
pages = {164-184},
zbl = {0149.19302},
url = {http://dml.mathdoc.fr/item/GDZPPN002182106}
}
Lane, N.D.; Singh, K.D. Characteristic and order of conically differentiable points.. Journal für die reine und angewandte Mathematik, Tome 222 (1966) pp. 164-184. http://gdmltest.u-ga.fr/item/GDZPPN002182106/