@article{1181072973, author = {Herrero, Domingo A.}, title = {The Diagonal Entries of a Hilbert Space Operator}, journal = {Rocky Mountain J. Math.}, volume = {21}, number = {4}, year = {1991}, pages = { 857-865}, language = {en}, url = {http://dml.mathdoc.fr/item/1181072973} }
Herrero, Domingo A. The Diagonal Entries of a Hilbert Space Operator. Rocky Mountain J. Math., Tome 21 (1991) no. 4, pp. 857-865. http://gdmltest.u-ga.fr/item/1181072973/