M. AHEIBAM, R. SINGH, S. M. FEROZE, and S. CHIPHANG, “Food security through crop diversification in Manipur: Application of Heckman Sample Selection Model”, Indian J Agri Sci, vol. 93, no. 1, pp. 89–93, Jan. 2023, doi: 10.56093/ijas.v93i1.102783.