W. M. N. Ratnayake, B. Olsson, D. Matthews, R. G. Ackman. "Preparation of Omega-3 PUFA Concentrates from Fish Oils via Urea Complexation". Fett Wissenschaft Technologie/Fat Science Technology. 1988, v. 90 Issue 10, Pages 381 - 386.
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http://dx.doi.org/10.1002/lipi.19880901002