“Purification of chorionic gonadotropin by means of the adsorption on caolin and elution with alcoholic solution of ammonium acetate”, jpb, vol. 15, no. 4, pp. 233–239, Dec. 1959, Accessed: Jul. 08, 2025. [Online]. Available: https://revistas.unav.edu/index.php/ref/article/view/48894