Syrmpas Ι., Goudas Μ., Digelidis Ν., and Papaioannou Α. “‘After School Exercise’: A Program to Promote Students Physical Activity ΙΙI. Students’ Knowledge Development (Short Version of a Greek Article)”. Inquiries in Physical Education and Sport, vol. 18, no. 2, July 2020, pp. 116-23, https://journals.lib.uth.gr/index.php/inquiries/article/view/1546.