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“Fotométria UBVRI de las regiones S61, S219, S285 y S299”., RMxAA, vol. 14, no. 1, pp. 437–439, Jan. 1987, Accessed: Dec. 09, 2025. [Online]. Available: https://astronomia.unam.mx/journals/rmxaa/article/view/1987rmxaa..14..437l