Indarto, I., E. Novita, S. Wahyuningsih, N. D. Herlinda, and E. Hidayah. “Application of Recursive Digital Filter (RDF) Methods for Baseflow Separation: Study at Brantas Watershed”. Journal of Natural Resources and Environmental Management, Vol. 9, no. 3, Oct. 2019, pp. 626-40, doi:10.29244/jpsl.9.3.626-640.