The effect of metal ions towards the photocatalytic degradation of asulam / by 185209 A. A. Aziz, Razak Ali, Zainab Ramli, 1959-, Wan Azelee Wan Abu Bakar, Tanaka, K., Universiti Teknologi Malaysia. Fakulti Sains. Jabatan Kimia, JSPS-VCC Seminar on Integrated Engineering (7th : 1998 : University of Malaya, Kuala Lumpur)