Yasawardene SG, Wijeratne TK and Yasawardene S. Proc. of 56th Annual Sessions of Sri Lanka Association for the Advancement of Science 27 Nov - 01 Dec, 2000.
Bandusena MM, Yasawardene SG, Liyanage WDSNW. 5th Annual Academic Sessions, Faculty of Medical Sciences, University of Sri Jayewardenepura 18-19 Jan. 2007
Shiyanth S, Chandrasekera S, Dissanayake PH and Yasawardene SG. The 41stAnnual Academic Sessions of the College of Surgeons of Sri Lanka jointly held with The Royal College of Surgeons of Edinburge. 15-18 August. 2012.
Dissanayake S, Yasawardene SG, Welgama DC. 5th Annual Academic Sessions, Faculty of Medical Sciences, University of Sri Jayewardenepura 18-19 Jan. 2007