@article{1103038401,
author = {Balakrishnan, A. V.},
title = {Fractional powers of closed operators and the semigroups generated by them.},
journal = {Pacific J. Math.},
volume = {10},
number = {4},
year = {1960},
pages = { 419-437},
language = {en},
url = {http://dml.mathdoc.fr/item/1103038401}
}
Balakrishnan, A. V. Fractional powers of closed operators and the semigroups generated by them.. Pacific J. Math., Tome 10 (1960) no. 4, pp. 419-437. http://gdmltest.u-ga.fr/item/1103038401/