Kelley, R. “ltrastructural vidence of ceptor-ediated ndocytosis uring arly ouse imb orphogenesis: hree imensional nalysis sing eep tching and canning lectron icroscopy”. cta icroscopica, ol. 1, no. 1, Mar. 1992, pp. 103-8, https://acta-microscopica.org/acta/article/view/15.