Preparation of serum and plasma proteins IV. A system for the separation into fractions of protein and lipoprotein components of biological tissues and fluids - Cohn, E. J; Strong, L. E; Huges, W. L, Jr; Mulford, D. J; Ashworth, J. N; Melin, M; Taylor, H. L (J. Amer. chem. Soc., 1946)