An existence result for a multipoint boundary value problem on a time scale. Karna, Basant; Lawrence, Bonita A. — 2006 Advances in Difference Equations [electronic only]
Comparison of eigenvalues for a fourth-order four-point boundary value problem. Karna, Basant K.; Kaufmann, Eric R.; Nobles, Jason — 2005 Electronic Journal of Qualitative Theory of Differential Equations [electronic only]