1. Bieniawaski ZI (1975) The point load test in geotechnical practice. Eng Geol 9:1–11
2. Deere DV, Miller RP (1966) Engineering classification and index properties for intact rock. US Air Force Weapons Laboratory Technology Report, AFNL-TR-65–166
3. Elueze AA, Ogbe FGA (1988) Decorative and ornamental stones-construction materials. In: Adegoke OS, Adenira SA, Elueze AA (eds) Guide to the non-metallic minerals industrial potentials of Nigeria. Raw Materials Research and Development Councils of Nigeria, Abuja, Nigeria, pp 23–24
4. Elueze AA, Olugbenga AO (2003) Rock polishing in Nigeria. J Min Geosci Soc 30:250–254
5. Elueze AA (1992) Rift system for proterozoic schists belts in Nigeria. Tectonophysics 209:167–169