Syrmpas Ι., and Goudas Μ. “‘After School Exercise’: A Program to Promote Students’ Physical Activity IV. Physical Education Teachers’ Perceptions of the Program (Short Version of a Greek Article)”. Inquiries in Physical Education and Sport, vol. 18, no. 2, July 2020, pp. 134-41, https://journals.lib.uth.gr/index.php/inquiries/article/view/1548.