@article{GDZPPN00243296X, title = {Extremal Maps of a Hilbert Space Equipped with a Natural Cone.}, journal = {Mathematische Zeitschrift}, volume = {194}, year = {1987}, pages = {95-98}, zbl = {0589.47048}, url = {http://dml.mathdoc.fr/item/GDZPPN00243296X} }
Dang, Trien Bang. Extremal Maps of a Hilbert Space Equipped with a Natural Cone.. Mathematische Zeitschrift, Tome 194 (1987) pp. 95-98. http://gdmltest.u-ga.fr/item/GDZPPN00243296X/