Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1961_139_1_a11, author = {\`E. R. Tsekanovskii}, title = {The real and imaginary parts of an unbounded operator}, journal = {Doklady Akademii Nauk}, pages = {48--51}, publisher = {mathdoc}, volume = {139}, number = {1}, year = {1961}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1961_139_1_a11/} }
È. R. Tsekanovskii. The real and imaginary parts of an unbounded operator. Doklady Akademii Nauk, Tome 139 (1961) no. 1, pp. 48-51. http://geodesic.mathdoc.fr/item/DAN_1961_139_1_a11/