S. Geelen

Antinociceptive effects of tramadol hydrochloride after intravenous administration to Hispaniolan Amazon parrots (Amazona ventralis).

N. Keuler, J. Paul-Murphy, M. Souza, 2013, American journal of veterinary research.

Assay and purity control of oxytetracycline and doxycycline by thin-layer chromatography--a comparison with liquid chromatography.

E. Roets, J. Hoogmartens, S. Geelen, 1990, Journal of pharmaceutical and biomedical analysis.