1. S. Impens, The use of gas chromatography–tandem mass spectrometry (GC–MS-MS) for optimization of targeted research on residues in matrices of animal origin, Ph.D. Thesis, Ghent University, Ghent, Belgium, 2002, p. 201, ISBN 90-5864-025-6.
2. Recent developments in the use and abuse of growth promoters
3. S. Poelmans, Application of GC– and LC–MS in the analysis and metabolization studies of steroids in livestock and aquatic invertebrates, Ph.D. Thesis, Ghent University, Ghent, Belgium, 2006, p. 196, ISBN 90-5864-094-9.
4. Phytosterols: Applications and recovery methods