@article{1102969434, author = {de Pillis, John}, title = {Convexity properties of a generalized numerical range.}, journal = {Pacific J. Math.}, volume = {39}, number = {3}, year = {1971}, pages = { 767-781}, language = {en}, url = {http://dml.mathdoc.fr/item/1102969434} }
de Pillis, John. Convexity properties of a generalized numerical range.. Pacific J. Math., Tome 39 (1971) no. 3, pp. 767-781. http://gdmltest.u-ga.fr/item/1102969434/