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M. Yulianti, “Article RETRACTED due to manipulation by the authors Modelo de aprendizaje cooperativo tipo STAD y modelo de aprendizaje convencional: estudio comparativo de los resultados del aprendizaje de las técnicas básicas de pase inferior en voleibol (STAD-type cooperative learning model and conventional learning model: a comparative study on the learning outcomes of basic volleyball lower passing techniques): Article RETRACTED due to manipulation by the authors”, Retos, vol. 55, pp. 346–352, Jun. 2024, doi: 10.47197/retos.v55.103770.