Paa, A. D., and I. Solekhudin. “Implementation of Dual Reciprocity Boundary Element Method to Solve The Mathematical Model of Steady Infiltration in Heterogeneous Soils Vertically”. Journal of the Indonesian Mathematical Society, vol. 31, no. 3, Aug. 2025, p. 1964, doi:10.22342/jims.v31i3.1964.