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@article{SF_1985__31_134755, author = {J.R. Dorroh}, title = {Semigroups of operators and second-order {Cauchy} problems.}, journal = {Semigroup forum}, pages = {297--304}, publisher = {mathdoc}, volume = {31}, year = {1985}, zbl = {0557.47028}, url = {http://geodesic.mathdoc.fr/item/SF_1985__31_134755/} }
J.R. Dorroh. Semigroups of operators and second-order Cauchy problems.. Semigroup forum, Tome 31 (1985), pp. 297-304. http://geodesic.mathdoc.fr/item/SF_1985__31_134755/