Mahmood, M. F., U. Shakir, M. K. Abuzar, M. A. Khan, N. Khattak, H. S. Hussain, and A. R. Tahir. “Probabilistic Neural Network Approach for Porosity Prediction in Balkassar Area: A Case Study”. Journal of Himalayan Earth Sciences, vol. 51, no. 1A, Mar. 2017, pp. 111-20, http://ojs.uop.edu.pk/jhes/article/view/1892.