1. Abramowitz M, Stegun I (1965) Handbook of mathematical functions with formulas, graphs, and mathematical table. Dover, New York
2. Ahmed S, Hussain Z, Qureshi AS, Majeed R, Saleem M (2004) Drought mitigation in Pakistan: current status and options for future strategies. Working paper 85. International Water Management Institute, Colombo
3. Ashraf M, Majeed A (2006) Water requirements of major crops for different agro-climatic zones of Balochistan. Water Conservation Union (IUCN), Water Program, Balochistan Program Office
4. Ashraf M, Routray JK (2013) Perception and understanding of drought and coping strategies of farming households in north-west Balochistan. Int J Disaster Risk Reduct 5:49–60. doi: 10.1016/j.ijdrr.2013.05.002
5. Bordi I, Fraedrich K, Gerstengarbe FW, Werner PC, Sutera A (2004) Potential predictability of dry and wet periods: Sicily and Elbe-Basin (Germany). Theor Appl Climatol 77(3):125–138. doi: 10.1007/s00704-003-0029-0