“The distance and reddening of the open cluster NGC 7790 and the luminosity of its three Cepheids”., RMxAA, vol. 14, no. 1, p. 440, Jan. 1987, Accessed: Dec. 11, 2025. [Online]. Available: https://astronomia.unam.mx/journals/rmxaa/article/view/1987rmxaa..14..440a