Heavy metal (Cd, Cu, Pb, and Zn) concentrations in the shells of Nerita lineata collected from the west intertidal area of Peninsular Malaysia - Cheng, Wan Hee; Yap, Chee Kong; Ismail, Ahmad; Ismail, Abdul Rahim; Tan, Soon Guan (Faculty of Science, Universiti Putra Malaysia, 2009)