Singh, A.K., Bhakat, C., Mandal, D.K., Mandal, A., Chatterjee, A., Ghosh, M.K., Dutta, T.K., Karunakaran, M.. “Factors Associated with Negative Energy Balance and Its Effect on Behavior and Production Performance of Dairy Cows: A Review.” Iranian Journal of Applied Animal Science, vol. 11, no. 4, 2021, pp. 641-653.