Eigenvalue intervals for higher order problems with singular nonlinearities. - Donal O'Regan; Aleksandra Orpel (Appl. Math. Comput., 2011)

A variational approach to the eigenvalue problem for higher order BVPs with singular nonlinearities. - Donal O'Regan; Aleksandra Orpel (Appl. Math. Comput., 2012)