[1]
N. Venugopal, M. Meenakshi Bai, M. V. Durga Prasad, T. V. Rama Mohan, “PERT & CPM Approach to CE- Optimal Plans”, J. Int. Acad. Phys. Sci., vol. 2, no. 1-4, pp. 111–117, Dec. 1998.