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Aleksandrs Kovalcuks,  Comparison of Bioactive Compound Content in Egg Yolk Oil Extracted from Eggs Obtained from Different Laying Hen Housing Systems.   journal   = {International Journal of Biological, Biomolecular, Agricultural, Food and Biotechnological Engineering}, [online]. World Academy of Science, Engineering and Technology. June 2015, vol. 102(6). 589 - 593[viewed 18 September 2018]. Available from: http://waset.org/publications/10001374.