R. A. PARRAY, I. MANI, A. KUMAR, T. KHURA, and E. VERGHESE, “Web based machinery fleet size selection model for paddy-wheat cropping system”, Indian J Agri Sci, vol. 88, no. 4, pp. 568–572, Apr. 2018, doi: 10.56093/ijas.v88i4.79116.