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@article{IM_1988__94_2_143634, author = {Bernd Carl and Alain Pajor}, title = {Gelfand numbers of operators with values in a {Hilbert} space.}, journal = {Inventiones mathematicae}, pages = {479--504}, publisher = {mathdoc}, volume = {94}, number = {2}, year = {1988}, zbl = {0668.47014}, url = {http://geodesic.mathdoc.fr/item/IM_1988__94_2_143634/} }
Bernd Carl; Alain Pajor. Gelfand numbers of operators with values in a Hilbert space.. Inventiones mathematicae, Tome 94 (1988) no. 2, pp. 479-504. http://geodesic.mathdoc.fr/item/IM_1988__94_2_143634/