Stewart , J., V. Mercadante, N. Dias, S. Stella, L. Cunha, I. Canisso, and F. Lima. “Nerve Growth Factor β Increases Small Luteal Cell Number and Enhances Steroidogenic Activity in Bovine Corpus Luteum”. Clinical Theriogenology, vol. 11, no. 3, Sept. 2019, p. 445, https://clinicaltheriogenology.net/index.php/CT/article/view/10212.