@article{1103038060, author = {Coddington, Earl A.}, title = {Normal extensions of formally normal operators.}, journal = {Pacific J. Math.}, volume = {10}, number = {4}, year = {1960}, pages = { 1203-1209}, language = {en}, url = {http://dml.mathdoc.fr/item/1103038060} }
Coddington, Earl A. Normal extensions of formally normal operators.. Pacific J. Math., Tome 10 (1960) no. 4, pp. 1203-1209. http://gdmltest.u-ga.fr/item/1103038060/