@article{1138036714, author = {Blair, D. E. and Wilker, J. B.}, title = {When does inversion preserve convexity?}, journal = {Kodai Math. J.}, volume = {6}, number = {1}, year = {1983}, pages = { 186-192}, language = {en}, url = {http://dml.mathdoc.fr/item/1138036714} }
Blair, D. E.; Wilker, J. B. When does inversion preserve convexity?. Kodai Math. J., Tome 6 (1983) no. 1, pp. 186-192. http://gdmltest.u-ga.fr/item/1138036714/