L. Keng

Determination of trimethoprim and sulphadoxine residues in porcine tissues and plasma.

P. Thacker, J. Boison, R. Cassidy, 1996, Canadian journal of veterinary research = Revue canadienne de recherche veterinaire.

Determination of penicillin G in bovine plasma by high-performance liquid chromatography after pre-column derivatization.

M. Papich, J. Boison, J. Macneil, 1992, Journal of chromatography.

Simultaneous determination of six penicillins in cows' raw milk by a multiresidue high-performance liquid chromatographic method.

L. K. Sørensen, J. Boison, L. Keng, 1997, Journal of chromatography. B, Biomedical sciences and applications.