Ishaq, Saima, and Ahsan -ul- Haq Satti. “Testing for Homogenous or Heterogenous Doers in Longitudinal Latent Class Regression Framework”. Empirical Economic Review 6, no. 1 (June 30, 2023): 20–46. Accessed August 8, 2026. https://ojs.umt.edu.pk/index.php/eer/article/view/1584.