@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/