Filippidou Χ., Loupos Δ., Zafireiadis Σ., & Barkoukis Β. (2014). Intensity and Direction of Precompetitive Anxiety: A Study of the Individual Zones of Optimal Functioning Theory in Swimming. Inquiries in Physical Education and Sport, 12(2), 90–100. https://doi.org/10.26253/heal.uth.ojs.ispe.2014.1422