1. Government of Canada working with egg producers to strengthen traceability;AAFC,2010
2. Tracing the Yellow River;BFREPA,2009
3. Knowledge guide, egg sizes and quality;BLE,2011
4. Herkunftsbestimmung von Bioeiern und deren mögliche Differenzierung von konventionellen Eiern mit Hilfe der stabilen Isotope der Bioelemente;Boner,2003
5. High precision isotope ratio monitoring techniques in mass spectrometry;Brand;Journal of Mass Spectrometry,1996