Phan, H. T., Vuong, H. N. S., Ha, A. T., Nguyen, A. T. V., Truong, T. Q., Le, D. N. T., Trinh, L. T. P., & Huynh, B. V. (2023). Optimization of essential oil extraction process from Piper nigrum L. by-products and investigation of its biological activities. The Journal of Agriculture and Development 22(6), 54-64.