George Ritchey

[1972] The Ritchey-Chr├ętien Aplanatic Telescope: Letters from George Willis Ritchey to Elihu Thomson ; Harold J. Abrahams ; Proceedings of the American Philosophical Society 116 (1972) p. 486 [lien]
[1976] Ritchey, Curtis and the Discovery of Novae in Spiral Nebulae ; M. A. Hoskin ; Journal for the History of Astronomy 7 (1976) p. 47 [lien]