1. Berg, T., Royset, O., Steinnes, E.: Principal component analysis of data for trace elements and main components in precipitation falling on Norway. Environ. Monit. Assess. 31, 259–273 (1994)
2. Berner, E.K., Berner, R.A.: Global Environment: Water, Air and Geochemical Cycles, 2nd edn. Princeton University Press, New Jersey (2012) 488 pp
3. Bhaskar, V.V., Rao, P.S.P.: Annual and decadal variation in chemical composition of rain water at all ten GAW stations in India. J. Atmos. Chem. 74, 23–53 (2017)
4. Bisht, D.S., Tiwari, S., Srivastava, A.K., Singh, J.V., Singh, B.P., Srivastava, M.K.: High concentration of acidic species in rainwater at Varanasi in the indo-Gangetic plains, India. Nat. Hazards. 75, 2985–3003 (2015)
5. Budhavant, K.B., Rao, P.S., Safai, P.D., Ali, S.K.: Influence of local sources on rainwater chemistry over Pune region, India. Atmos. Res. 100, 121–131 (2011)