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@article{MZ_1987__194_173818, author = {Trien Bang Dang}, title = {Extremal {Maps} of a {Hilbert} {Space} {Equipped} with a {Natural} {Cone.}}, journal = {Mathematische Zeitschrift}, pages = {95--98}, publisher = {mathdoc}, volume = {194}, year = {1987}, zbl = {0589.47048}, url = {http://geodesic.mathdoc.fr/item/MZ_1987__194_173818/} }
Trien Bang Dang. Extremal Maps of a Hilbert Space Equipped with a Natural Cone.. Mathematische Zeitschrift, Tome 194 (1987), pp. 95-98. http://geodesic.mathdoc.fr/item/MZ_1987__194_173818/