@Article{Byszewski2012, author = "Byszewski, Ludwik and Winiarska, Teresa", title = "An abstract nonlocal second order evolution problem", journal = "Opuscula Math.", year = "2012", volume = "32", number = "1", pages = "75--82", doi = "http://dx.doi.org/10.7494/OpMath.2012.32.1.75", url = "http://dx.doi.org/10.7494/OpMath.2012.32.1.75", abstract = "The aim of the paper is to prove theorems on the existence and uniqueness of mild and classical solutions of a semilinear evolution second order equation together with nonlocal conditions. The theory of strongly continuous cosine families of linear operators in a Banach space is applied.", keywords = "nonlocal, second order, evolution problem, Banach space", issn = "1232-9274" }