Chikhaoui, M. . “Behavioural Heterogeneity and Stock Market Dynamics During the COVID-19 Pandemic and Ukraine War: An Empirical Markov Switching Analysis of the GCC Countries”. Asian Economic and Financial Review, vol. 15, no. 12, Dec. 2025, pp. 2000-19, doi:10.55493/5002.v15i12.5783.