@article{abdelsalam2025nonparametric,
  author = {Abdel-Salam G. Abdel-Salam and Ibrahim A. Ahmad},
  title = {Nonparametric Functions Estimation Using Biased Data},
  year = {2025},
  journal = {Mathematics},
  volume = {13},
  number = {24},
  pages = {4037},
  publisher = {MDPI AG},
  doi = {10.3390/math13244037}
}