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	1.	The relation between pituitary gland and thyroid growth during the lifespan of the annual fish Cynolebias whitei and Nothobranchius korthausae: gonadotropic and thyrotropic cells. [electronic resource] by Ruijter, J M Peute, J Levels, P J Producer: 19870828 In: Cell and tissue research vol. 248 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	2.	Oxygen consumption during embryonic development of the annual fish Nothobranchius korthausae with special reference to diapause. [electronic resource] by Levels, P J Gubbels, R E Denucé, J M Producer: 19861031 In: Comparative biochemistry and physiology. A, Comparative physiology vol. 84 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	3.	Determination of polycyclic aromatic hydrocarbons (PAH) and their metabolites in blood, feces, and urine of rats orally exposed to PAH contaminated soils. [electronic resource] by van Schooten, F J Moonen, E J van der Wal, L Levels, P Kleinjans, J C Producer: 19980105 In: Archives of environmental contamination and toxicology vol. 33 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)
	4.	Chromatographic methods for the determination of toxicants in faeces. [electronic resource] by de Kok, T M Levels, P J van Faassen, A Hazen, M ten Hoor, F Kleinjans, J C Producer: 19921118 In: Journal of chromatography vol. 580 Online resources: Available from publisher's website Availability: No items available. Save to lists Add to cart (remove)