Laporan PPM K010/2011: Laporan Menghadiri "The 5th Icwert International Conference On Earth Resources Technology", Hotel Heritage, Ipoh, Perak, 10 - 11 Mei 2011 Ismail b. Ibrahim - Perak Pusat Penyelidikan Mineral, Jabatan Mineral Dan Geosains Malaysia 2011 - 13 p. ill.; 29 cm