These are what I found but they are not all academic studies and I am not sure whether the data was always collected as you have requested:
Phillimore, J., & Goodson, L. (2006). Problem or opportunity? Asylum seekers, refugees, employment and social exclusion in deprived urban areas. Urban Studies, 43(10), 1715-1736.
http://www.researchgate.net/publication/248974040
Small, R., Gagnon, A., Gissler, M., Zeitlin, J., Bennis, M., Glazier, R. H., ... & Vangen, S. (2008). Somali women and their pregnancy outcomes postmigration: data from six receiving countries. BJOG: An International Journal of Obstetrics & Gynaecology, 115(13), 1630-1640.
http://www.researchgate.net/publication/23499752
Giles S. (2102) A data collection project on refugees and asylum seekers in Oxfordshire. Refugee Resource UK Data Project 2012
Aspinall, P., & Watters, C. (2010). Refugees and asylum seekers: A review from an equality and human rights perspective. Manchester: Equality and Human Rights Commission. (University of Kent)
Quevedo, G. (2010). Mapping refugee and migrant communities in the UK. London: Information Centre about Asylum and Refugees (ICAR) available from http://www. icar. org. uk/[accessed 5 May 2011].
Chin, A., & Cortes, K. E. The Refugee/Asylum Seeker Chapter 12, pp. 585-658. IN: Chiswick BR & Miller PW (2015) Handbook on the Economics of International Immigration, Volume 1
First of all, thank you for your answer and your suggestions.
I have already found some of the papers you cite, but some other resources you suggest may be useful for my work. So, thanks!
Anyway, probably I must have been more clear in asking my question or provide more details.
What I'm searching for are studies which use administrative individual data from refugees' centers. So, not aggregate data from various statistical sources, and not data on refugees collected somehow after they left the centers or in another period of their lives.
I hope this further explanation will be useful to have additional suggestions from you and from other readers.