Kouesseu, E. Y., De Kock, M., Lavand’homme, P., & Waterloos, H. (2001). Short and Long-term Analgesic Effect of Intraoperative Intravenous or Epidural ketamine Administration. Acta Anaesthesiologica Belgica, 52(2). https://hdl.handle.net/2078.5/63675 (Original work published 2001)