Kodituwakku, S.R.Bertok, P.2010-07-062010-07-062008-9Journal of the National Science Foundation of Sri Lanka, 36(3):p.219-227https://dl.nsf.gov.lk/handle/1/5869Design patternsClass diagramsPattern formalismComputer softwareObject -oriented designsInformation Communication TechnologyA mathematical approach to object oriented design patternsArticle