SETYAWAN, Hendra et al. Article RETRACTED due to manipulation by the authors El efecto de la implementación de material de tiro con arco de gestión de clases de educación física para mejorar la concentración de los estudiantes de primaria (The Effect Of Implementing Physical Education Class Management Archery Material To Improve Concentration Elementary School Students): Article RETRACTED due to manipulation by the authors. Retos, [S. l.], v. 56, p. 879–886, 2024. DOI: 10.47197/retos.v56.105216. Disponível em: https://recyt.fecyt.es/index.php/retos/article/view/105216. Acesso em: 20 jun. 2025.