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• O.J.Fernando v. T.D. Fernando – NLR – 429 of 69 [1965] LKSC 34; (1965) 69 NLR 429 (3 September 1965)
• O.T. De Silva v. K.S. De Silva – NLR – 343 of 53 [1951] LKSC 11; (1951) 53 NLR 343 (16 October 1951)
• Obeyesekere v. Jane Nona – NLR – 41 of 59 [1957] LKSC 29; (1957) 59 NLR 41 (14 June 1957)
• Officer In Charge, Cid v. Soris – SLR – 375, Vol 3 of 2006 [2005] LKSC 20; (2006) 3 Sri LR 375 (12 October 2005)
• Organization Of Protection Of Human Rights And Rights Of Insurance Employees And Others v. Public Enterprises Reform Commission And Others – SLR – 316, Vol 2 of 2007 [2007] LKSC 13; (2007) 2 Sri LR 316 (12 December 2007)
• Orr v. The District Judge, Kalutara – NLR – 204 of 49 [1948] LKSC 5; (1948) 49 NLR 204 (23 January 1948)