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Books about Tilakaratna:
Minivan Pi. Tilakaratna: Keti kata vimarsana by Kulatilaka Kumarasimha (1996)
Wiki information Tilakaratna:
Bernard Tilakaratna, SLOS was a senior diplomat and bureaucrat of the Sri Lankan government. He was an ambassador to many countries and prior to retirement was the permanent secretary to Ministry of Foreign Affairs.