U. Kohls

Determination of common drugs of abuse in body fluids using one isolation procedure and liquid chromatography--atmospheric-pressure chemical-ionization mass spectromery.

K. Krüger, M. Bogusz, R. Maier, 1998, Journal of analytical toxicology.

Applicability of various brands of mixed-phase extraction columns for opiate extraction from blood and serum.

M. Bogusz, R. Maier, U. Kohls, 1996, Journal of chromatography. B, Biomedical applications.

Detection of non-prescription heroin markers in urine with liquid chromatography-atmospheric pressure chemical ionization mass spectrometry.

R. Maier, M. Erkens, U. Kohls, 2001, Journal of analytical toxicology.