@article{UlrichsNoethlingKelleretal.1987,
  author    = {Karin Ulrichs and R. N{\"o}thling and R. Keller and U. Heusermann and W. M{\"u}ller-Buchholtz},
  title     = {Genetically determined variation of constitutive major histocompatibility complex class II antigen expression in various rat strains and cell types},
  year      = {1987},
}