Khudhair Mhmood, Zinah, et al. “Analysis of the Effects of Geopolitical Risk and Remittances on Informal Employment in Selected OPEC Countries (Quantile Approach)”. Future of Work and Digital Management Journal, Sept. 2025, pp. 1-11, https://journalfwdmj.com/index.php/fwdmj/article/view/93.