Bayat, M., Aghajani-Mersa, H., & Hazrati- Sowme'eh, Z. "Application of Grounded Theory on social security challenges of immigrants living in Tehran (Case study: Citizens of foreign countries visiting the Bureau of Social Security of West of Great Tehran)", Journal of Population Association of Iran, 15, 30, 2020, 343-369. doi: 10.22034/jpai.2021.538986.1197