On the existence of equilibrium states of an elastic beam on a nonlinear foundation. Elgindi, M.B.M.; Yen, D.H.Y. — 1993 International Journal of Mathematics and Mathematical Sciences
Existence of equilibrium states of hollow elastic cylinders submerged in a fluid. Elgindi, M.B.M.; Yen, D.H.Y. — 1992 International Journal of Mathematics and Mathematical Sciences