1. Ahlfeld F (1932) Die Silberzlagerstätte Colquijirca, Perú. Zeitschrift Praktische Geologie 40:81–87
2. Angeles C (1993) Geología de Colquijirca y alrededores. Informe privado Sociedad Minera El Brocal S.A., p 39
3. Balogh K (1985) K/Ar dating of Neogene volcanic activity in Hungary: Experimental technique, experiences and methods of chronologic studies. ATOMKI Rep D 1:277–288
4. Bartos PJ (1987) Quiruvilca, Peru: mineral zoning and timing of wall-rock alteration relative to Cu-Pb-Zn-Ag vein-fill deposition. Econ Geol 82:1431–1452
5. Baumgartner R (2007) The Cerro de Pasco Cordilleran base metal deposit, central Peru. University of Geneva, PhD thesis