C. R. Oktarina, S. Nugroho, I. Sriliana, P. Novianti, E. Sunandi, and R. Pahlepi, “Estimation of Stunting and Wasting in Sumatra 2022 with Nadaraya-Watson Kernel and Penalized Spline”, Inferensi, vol. 8, no. 3, pp. 197–208, Nov. 2025.