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@article{AM2_1985__29_137090, author = {Chun-San Lee and Sen-Yen Shaw}, title = {Representation formulas for cosine and sine functions of operators.}, journal = {Aequationes mathematicae}, pages = {162--171}, publisher = {mathdoc}, volume = {29}, year = {1985}, zbl = {0591.47028}, url = {http://geodesic.mathdoc.fr/item/AM2_1985__29_137090/} }
Chun-San Lee; Sen-Yen Shaw. Representation formulas for cosine and sine functions of operators.. Aequationes mathematicae, Tome 29 (1985), pp. 162-171. http://geodesic.mathdoc.fr/item/AM2_1985__29_137090/