Polevoy G. ARTICLE RETRACTED DUE TO PLAGIARISM BY THE AUTHOR Períodos sensibles de desarrollo de la flexibilidad en la edad escolar (Sensitive periods of flexibility development at school age): ARTICLE RETRACTED DUE TO PLAGIARISM BY THE AUTHOR. Retos [Internet]. 1 de julio de 2024 [citado 21 de agosto de 2025];56:1066-74. Disponible en: http://www.revistaretos.org/index.php/retos/article/view/106243