D. T. T. Van, N. Thi Thu, N. Hong Linh, N. Thi Men, T. Van Khanh, and L. T. Nhi Cong, “Efficiency of using probiotic Elac-grow and Han-proway in laying-egg hens”, Vietnam J. Biotechnol., vol. 20, no. 1, pp. 143–150, Mar. 2022.