Regularity of the solution of the first initial-boundary value problem for hyperbolic equations in domains with cuspidal points on boundary. Nguyen Manh Hung, Vu Trong Luong (2009) Boundary Value Problems [electronic only]
Remarks on nonlinear biharmonic evolution equation of Kirchhoff type in noncylindrical domain. Límaco, J., Clark, H.R., Medeiros, L.A. (2003) International Journal of Mathematics and Mathematical Sciences