(1)
R.S. Ramakrishna; R.E. Rajaseelan; J.M.T.B. Karunaratne; M. Balasubramaniam; R.R. Brooks; D.E. Ryan; J. Holzbecher. A Geochemical Reconnaissance Survey of Sri Lanka Using Panned Mineral Concentrates of Stream Sediments. njg 1985, 237-244.