Prentis, J. M. Mechanical vibrations : an introduction to matrix methods / J.M. Prentis and F.A. Leckie. - London : Longmans, Green and Co., 1963. - viii, 139, [3] p. : ill. ; 22 cm. Subjects--Topical Terms: Vibrations.Structural analysis (Engineering)--Matrix methods. Dewey Class. No.: 624.17 / PRM 1963