Maillard, N., Wolczynski, S., Argyriou, A., Drosdowsky, M., Foucault, P., & Carreau, S. (1969). Steroidogenesis in the two enriched-Leydig cell populations of human testis: evidence for a positive control by seminiferous tubules secreted factor(s). Archives of Andrology, 33(3), 187-99. https://doi.org/10.3109/01485019408987823 (Original work published 1969)