1. AOAC 1984 Official Methods of Analyses. Association of Official Analytical Chemists, Arlington, VA, USA.
2. Excretion of chromium sesquioxide administered as a component of paper to sheep
3. CVB 1988 Veevoedertabel. Centraal Veevoederbureau in Nederland, Lelystad, The Netherlands.
4. , , 1988 Phosphorus digestibility of some anorganic P-sources in pigs determined by quantitative collection of the faeces and with a marker. In: Digestive Physiology in the Pig, eds Buraczewska L, Buraczewski S, Pastuszewska B & Zebrowska T. Jablonna, Poland, pp 328–335.