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Journal of Dairy Science, Volume 50, Issue 11, November 1967, Pages 1764–1768
Rapid Method for Isolation of Unesterified Sterols and Its Application to Detection of MilkFat Adulteration with Vegetable Oils
Ira Katz, Mark Keeney
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http://dx.doi.org/10.3168/jds.S0022-0302(67)87713-0