@article{1259943308, author = {KOMATSU, Hikosaburo}, title = {Fractional powers of operators, III Negative powers}, journal = {J. Math. Soc. Japan}, volume = {21}, number = {2}, year = {1969}, pages = { 205-220}, language = {en}, url = {http://dml.mathdoc.fr/item/1259943308} }
KOMATSU, Hikosaburo. Fractional powers of operators, III Negative powers. J. Math. Soc. Japan, Tome 21 (1969) no. 2, pp. 205-220. http://gdmltest.u-ga.fr/item/1259943308/