1. Untersuchungen zur Zuchtwahl Schwarzbunter Milchrindbullen in zwei Selektionsstufen;Brade;Arch. Tierz.,1986
2. Mineralstoffbedarfsnormen für Rinder;Becker;Landwirtschaftliche Forschung,1971
3. Effects of two levels of phosphorus intake on performance and faecal phosphorus excretion of dairy cows;Brintrup;J. Anim. Physiol. Anim. Nutr.,1993
4. Improvement by means of selection;Cochran,1951
5. De Uitscheiding van Stikstof, Fosfor en Kalium Door Landbowhuisdieren, Nu en Morgen;Coppoolse,1990