1. The geology of the Sidikalang quadrangle, Sumatra;Aldiss,1983
2. Advanced argillic alteration and geochemistry of alunite in an evolving hydrothermal system at Baguio, northern Luzon, Philippines;Aoki;Resour. Geol.,1993
3. Occurrence model for enargite-gold deposits;Ashley;U.S. Geol. Surv. Open File Rep.,1982
4. Tectonic map of northern Sumatra (1:500,000);Aspden;British Geol. Surv.,1982
5. The geology of the Padangsidempuan and Sibolda Quadrangles, Sumatra (1:250,000);Aspden,1982