@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/