N. V. Thanh, P. T. . Hang, P. V. . Gioi, N. C. . Toan, and S. T. Long, “The Relationship Between Plasma Progesterone Concentration on Day 6 After Artificial Insemination and Pregnancy Rate of Dairy Cows in Vietnam”, Trop. Anim. Sci. J., vol. 46, no. 2, pp. 146–150, May 2023, doi: 10.5398/tasj.2023.46.2.146.