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W. Widiyanto, «Article RETRACTED due to manipulation by the authors Los diferentes resultados en lsa habilidades de servicio de los tenistas jóvenes evaluadas según el género y la edad (The Differences Result in Serve Skill of Junior Tennis Players Assessed Based on Gender and Age): Article RETRACTED due to manipulation by the authors», Retos, vol. 54, pp. 272–278, may 2024.