Z. Lotfi, F. Majidifar, and Z. S. Shamshiri, “Investigating the Mediating Role of Optimism and Psychological Flexibility in the Relationship Between COVID-19 Anxiety and Mental Health”, PDMD, vol. 4, no. 1, pp. 307–322, June 2025, doi: 10.61838/kman.pdmd.4.1.20.