Iranian Mathematical Society (IMS) Bulletin of the Iranian Mathematical Society 1017-060X 39 1 2013 03 01 Spacelike hypersurfaces in Riemannian or Lorentzian space forms satisfying L_k(x)=Ax+b205 223 en F. Pashaie Tarbiat Modares University, Iran S.M.B. Kashani Tarbiat Modares University 2011 05 30 Linearized operator $L_k$ Higher order mean curvatures Lorentzian space forms