Papagiannopoulos Διονύσιος, and Digelidis Νικόλαος. 2019. “The Teaching Approach TGFU and the Results of Its Application in Primary and Secondary Education”. Inquiries in Physical Education and Sport 17 (2):111-37. https://doi.org/10.26253/heal.uth.ojs.ispe.2019.1529.