[1]
M. Kjaer, H. Nielsen, F. E. Olsen, L. S. Andersen, J. Philipsen, and G. Velander, “Bioavailability and Analgesic Effect of Sustained Release Cetobemidone Capsules in Cancer Patients with Chronic Pain of Malignant Origin”, AO, vol. 31, no. 5, pp. 577–583, Jan. 1992.