G. N. SINGH; M. USMAN. Ratio-to-Product Exponential-Type Estimates Under Non-Response. Jordan Journal of Mathematics and Statistics, [S. l.], v. 12, n. 4, p. 593–616, 2025. Disponível em: https://jjms.yu.edu.jo/index.php/jjms/article/view/924. Acesso em: 3 oct. 2025.