Oktarina, Cinta Rizki, Sigit Nugroho, and Idhia Sriliana. 2026. “EVALUATION OF THE FLEXIBILITY OF NADARAYA-WATSON KERNEL AND PENALIZED SPLINE ESTIMATORS IN BIVARIATE RESPONSE NONPARAMETRIC REGRESSION MODELS”. BAREKENG: Jurnal Ilmu Matematika Dan Terapan 20 (3), 2179-94. https://doi.org/10.30598/barekengvol20iss3pp2179-2194.