Czibula, Istvan Gergely, Gabriela Czibula, and Grigoreta Sofia Cojocar. 2009. “Hierarchical Clustering for Identifying Crosscutting Concerns in Object Oriented Software Systems”. INFOCOMP Journal of Computer Science 8 (3):21-28. http://177.105.60.18/index.php/infocomp/article/view/267.