@article{00940751, title = {Shape groups for }, journal = {Mathematica Pannonica}, volume = {7}, year = {1996}, pages = {233-252}, zbl = {0858.46049}, language = {en}, url = {http://dml.mathdoc.fr/item/00940751} }
Čerin, Zvonko. Shape groups for . Mathematica Pannonica, Tome 7 (1996) pp. 233-252. http://gdmltest.u-ga.fr/item/00940751/