@article{1255988721, author = {Maher, P. J.}, title = {Partially isometric approximation of positive operators}, journal = {Illinois J. Math.}, volume = {33}, number = {4}, year = {1989}, pages = { 227-243}, language = {en}, url = {http://dml.mathdoc.fr/item/1255988721} }
Maher, P. J. Partially isometric approximation of positive operators. Illinois J. Math., Tome 33 (1989) no. 4, pp. 227-243. http://gdmltest.u-ga.fr/item/1255988721/