@misc{indiciae22ad12cea1ac,
  title = {Subpopulations of mononuclear cells in ageing: expansion of the null cell compartment and decrease in the number of T and B cells in human blood.},
  author = {G J Ligthart and H R Schuit and W Hijmans},
  year = {1985},
  url = {https://pubmed.ncbi.nlm.nih.gov/3873404/},
  note = {Source identifier: 3873404}
}