@article{GDZPPN002035952,
title = {Representation formulas for cosine and sine functions of operators II.},
journal = {Aequationes mathematicae},
volume = {30},
year = {1986},
pages = {64-75},
zbl = {0647.47048},
url = {http://dml.mathdoc.fr/item/GDZPPN002035952}
}
Shaw, S.-Y.; Lee, C.-S.; Chiou, W.-L. Representation formulas for cosine and sine functions of operators II.. Aequationes mathematicae, Tome 30 (1986) pp. 64-75. http://gdmltest.u-ga.fr/item/GDZPPN002035952/