R. Lumban Gaol, J. A. Siregar, A. E. S. Siagian, M. G. Sembiring, and E. R. Galingging, “EFFORTS TO DEVELOP INTEREST IN LEARNING MATHEMATICS USING THE DISCOVERY LEARNING MODEL FOR STUDENTS OF GRADE IV AT SD KARTIKA I-1 MEDAN”, JLE, vol. 1, no. 06, pp. 184–191, Jun. 2025.