?url_ver=Z39.88-2004&rft_val_fmt=info%3Aofi%2Ffmt%3Akev%3Amtx%3Adissertation&rft.au=Larsson%2C+Eva+Lena+Birgitta&rft.aulast=Larsson&rft.aufirst=Eva+Lena+Birgitta&rft.tpages=268&rft.degree=Doctoral&rft.inst=UCL+(University+College+London)&rft.title=An+%22in+vitro%22+analysis+of+murine+thymocyte-stromal+cell+interactions&rft.date=1991