1. Stable isotope variation as a tool to trace the authenticity of beef;Boner;Analytical and Bioanalytical Chemistry,2004
2. Breed Description. www.tiho-hannover.de/einricht/zucht/eaap/descript/920.htm; (from 30.05.2004)
3. Bronstein, S., & Semendjajew, K. A. (1991). Taschenbuch der Mathematik. 25. Aufl. B.G. Teubner Verlagsgesellschaft, Stuttgart, Leipzig, (pp. 687)
4. Isotopic standards for carbon and oxygen and correction factors for mass spectrometry analysis of carbon dioxide;Craig;Geochimica et Cosmochimica Acta,1957
5. Variation of O18 content of water from natural sources;Epstein;Geochimica Cosmochimica Acta,1953