Buligescu, Bianca, and Henry Espinoza Peňa. “Informal Payments in Romanian Health Care System. A Sample Selection Correction”. Sociologie Românească 18, no. 2 (November 10, 2020): 40-73. Accessed September 2, 2026. https://www.revistasociologieromaneasca.arsociologie.ro/sr/article/view/1688.