Yasui, T., A. Tsukise, T. Nara, Y. Kuwahara, and W. Meyer. “Morphological, Histochemical and Immunohistochemical Characterization of Secretory Production of the Ciliary Glands in the Porcine Eyelid”. European Journal of Histochemistry, vol. 50, no. 2, June 2009, pp. 99-108, doi:10.4081/979.