Doronin, Oleksii, and Rostislav Maiboroda. “GEE Estimators in Mixture Model With Varying Concentrations”. Acta Universitatis Lodziensis. Folia Oeconomica 3, no. 314 (February 29, 2016). Accessed February 7, 2026. https://www.czasopisma.uni.lodz.pl/foe/article/view/546.