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@article{AM2_1980__20_182388, author = {G.F. Webb}, title = {A representation formula for strongly continuous cosine families. {(Short} {Communication).}}, journal = {Aequationes mathematicae}, pages = {115--116}, publisher = {mathdoc}, volume = {20}, year = {1980}, zbl = {0467.47037}, url = {http://geodesic.mathdoc.fr/item/AM2_1980__20_182388/} }
G.F. Webb. A representation formula for strongly continuous cosine families. (Short Communication).. Aequationes mathematicae, Tome 20 (1980), pp. 115-116. http://geodesic.mathdoc.fr/item/AM2_1980__20_182388/