A.S.R.A.S. SASTRI, DIWAKAR NAIDU, and SOMNATH CHOUDHURY, “Agro-topo climatological studies for crop planning- a case study for the northen hills agrocliamtic zone of Chhattisgarh state”, J. Agrometeorol., vol. 11, no. 1, pp. 33–36, Jun. 2009.