On symmetries and invariant solutions of a coupled KdV system with variable coefficients. - Karanjeet Singh 001; Rajesh Kumar Gupta 002 (Int. J. Math. Math. Sci., 2005)

Benjamin-Bona-Mahony (BBM) equation with variable coefficients: Similarity reductions and Painlevé analysis. - Karanjeet Singh 001; Rajesh Kumar Gupta 002; Sachin Kumar (Appl. Math. Comput., 2011)