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@article{AM2_1980__21_182435, author = {G.F. Webb}, title = {A representation formula for strongly continuous cosine families.}, journal = {Aequationes mathematicae}, pages = {251--256}, publisher = {mathdoc}, volume = {21}, year = {1980}, zbl = {0467.47037}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182435/} }
G.F. Webb. A representation formula for strongly continuous cosine families.. Aequationes mathematicae, Tome 21 (1980), pp. 251-256. http://geodesic.mathdoc.fr/item/AM2_1980__21_182435/