1. Landslides and Erosion in the Catchment of the Gaula River, Kumaun Lesser Himalaya, India
2. Bieniawski, Z. T. Rock mass classification in rock engineering. Proceedings of the Symposium on Explorer for Rock Engineering. Johannesburg. Vol. 5, pp.97–106.
3. Brady, B. H.G. and Brown, E. T. 1993.Rock Mechanics for Underground Mining,, 2nd edn, 20–24. London: Chapman and Hall.
4. Cundall, P. A. Explicit finite difference methods in geomechanics. Proceedings of the Second International Conference Num. Meth. Geomech. Blacksburg, Virginia. Vol. 1, pp.132–150.