Lugo-Primelles, René. “El Sistema Epitermal-porfídico De Au-Cu San Nicolás - El Pilar - Gaspar, Ciego De Ávila, Cuba”. Geoinformativa 17 (February 5, 2024): https://cu-id.com/2277/v17e04. Accessed October 23, 2026. https://www.rgi.edicionescervantes.com/index.php/rgi/article/view/135.