S.M. Cramer, J.A. Moore, Y. Li, A. Kundu and Guhan Jayaraman, Displacement Chromatography of Proteins using Low Molecular Weight Displacers, U.S. Patent No. 5,478,924 , Dec. 26, 1995
S.M. Cramer, Guhan Jayaraman, A. Kundu, Y. Li and J.A. Moore, Protein Purification at Process Scale by Displacement Chromatography using Low Molecular Weight Anionic Displacers, U.S. Patent No. 5,606,033 , Feb. 25, 1997