Intelligent techniques for prediction of drilling rate for percussive drills in topically weathered limestone by Bhatawdekar, Ramesh Murlidhar, Roy, Bishwajit, Changtham, Saksarid, Khandelwal, Manoj, Armaghani, Danial Jahed, Mohamad, Edy Tonnizam, Pathak, Pranjal, Mondal, Subhrojit, Kumar, Radhikesh, Md. Dan, M. F.