Classification of Surfaces Via Morse Theory , Expositiones Mathematicae, 18, (2000, 037-074) with S. Kumaresan, Dept. of Maths, University of Mumbai and Abhijit Champanerkar, Dept. of Maths, University of Columbia, USA.

deRham Cohomology of Open Sets in $\mathbb{R}^n$} with Prof. S.Kumaresan, (preprint 2002.)

Existence of Riemannian metric $g$ on two dimensional torus for which the $\lambda_1(g)S. Kumaresan. (Preprint).