@article{00716397,
title = {Proper shape invariants: Smoothness and calmness.},
journal = {Mathematica Pannonica},
volume = {5},
year = {1994},
pages = {213-240},
zbl = {0823.54015},
language = {en},
url = {http://dml.mathdoc.fr/item/00716397}
}
Čerin, Zvonko. Proper shape invariants: Smoothness and calmness.. Mathematica Pannonica, Tome 5 (1994) pp. 213-240. http://gdmltest.u-ga.fr/item/00716397/