S. C. GIRI, S. K. SAHOO, M. K. PADHI, and D. K. KARNA, “Role of vitamin E and selenium in egg production, fertility and hatchability of native ducks”, Indian J of Anim Sci, vol. 82, no. 12, pp. 1515–1517, Dec. 2012, doi: 10.56093/ijans.v82i12.25667.