Distribution of chromium, manganese and cobalt in the bottom sediment of Pahang river-estuary, Pahang, Malaysia

B. Y. Kamaruzzaman, A. Siti Waznah, M. S.Mohd Zahir, M. C. Ong, S. Shahbudm, K. C.A. Jalal, Z. Rina Sharlmda, A. T. Shuhada, B. Akbar John, B. Joseph, S. M. Al-Barwani, J. S. Goddard