title: The vitamin D activity of butter: A chemical differentiation of the antirachitic factor of autumn and winter butter from irradiated ergosterol and the vitamin D of cod-liver oil.
authors.affiliation: The National Institute for Research in Dairying, University of Reading.
authors.forename: S A
authors.initials: SA
authors.lastname: Kon
authors.forename: R G
authors.initials: RG
authors.lastname: Booth