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(1989). Vidyodaya Journal of Science Vol.01, No.1&2. Nugegoda: University of Jayewardenepura.
1989. Vidyodaya Journal of Science Vol.01, No.1&2. Nugegoda: University of Jayewardenepura.
Vidyodaya Journal of Science Vol.01, No.1&2. Nugegoda: University of Jayewardenepura. 1989.
