Monard, AM., Berthels, J., Nedelkovitch, G., Draguet, M., & Bouche, R. (1986). Determination of the Total Vitamin-d3 Content of Cod-liver Oil By High-performance Liquid-chromatography. Pharmaceutica Acta Helvetiae, 61(7), 205-208. https://hdl.handle.net/2078.5/85441 (Original work published 1986)