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)