@article{04120846, title = {Fractional powers of non-negative operators in Fr\'echet spaces.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {12}, year = {1989}, pages = {309-320}, doi = {10.1155/S0161171289000360}, zbl = {0684.47013}, language = {en}, url = {http://dml.mathdoc.fr/item/04120846} }
Martinez, C.; Sanz, M.; Calvo, V. Fractional powers of non-negative operators in Fréchet spaces.. International Journal of Mathematics and Mathematical Sciences, Tome 12 (1989) pp. 309-320. doi : 10.1155/S0161171289000360. http://gdmltest.u-ga.fr/item/04120846/