Sarkar, A., S. Choudhury, N. Chaki, and S. Bhattacharya. “Conceptual Level Design of Object Oriented Data Warehouse: Graph Semantic Based Model”. INFOCOMP Journal of Computer Science, vol. 8, no. 4, Dec. 2009, pp. 60-70, https://infocomp.dcc.ufla.br/index.php/infocomp/article/view/283.