1. Adnan S, Ullah K, Gao S (2015) Characterization of drought and its assessment over Sindh, Pakistan during 1951–2010. J Meteor Res 29:837–857
2. Ahmad L, Parvaze S, Majid M, Kanth RH (2016) Analysis of historical rainfall data for drought investigation using standard precipitation index (SPI) under temperate conditions of Srinagar Kashmir. Pak J Meteorol 13:29–38
3. Amara DMK, Ullah K, Yushu Z (2020) Rainfall erosivity estimation for Sierra Leone using non-parametric indices. Theor App Climatol 139:221–236
4. Bates BC, Kundzewicz ZW, Wu S, Palutikof JP (2008) Climate change and water. TechnicalPaper of the Intergovernmental Panel on Climate Change, IPCC Secretariat, Geneva, 210
5. Bhalme HN (1991) El Nino-Southern Oscillation (ENSO) onset, growth and decay. WMO/TD No.496:84–87