@article{1102720105,
author = {Fattorini, H. O.},
title = {A note on fractional derivatives of semigroups and cosine functions.},
journal = {Pacific J. Math.},
volume = {109},
number = {2},
year = {1983},
pages = { 335-347},
language = {en},
url = {http://dml.mathdoc.fr/item/1102720105}
}
Fattorini, H. O. A note on fractional derivatives of semigroups and cosine functions.. Pacific J. Math., Tome 109 (1983) no. 2, pp. 335-347. http://gdmltest.u-ga.fr/item/1102720105/