Harper, G., Harper, G., Davies, M., Davis, S., Tadros, T., Taylor, D., . . . Waters, J. (1991). Steric stabilization of microspheres with grafted polyethylene oxide reduces phagocytosis by rat Kupffer cells in vitro. Biomaterials, 12(7), pp. 695-700. doi:10.1016/0142-9612(91)90119-U

Harper, Garry, G.R Harper, M.C Davies, S.S Davis, Th.F Tadros, D.C Taylor, M.P Irving, and J.A Waters. "Steric Stabilization of Microspheres With Grafted Polyethylene Oxide Reduces Phagocytosis By Rat Kupffer Cells in Vitro." Biomaterials 12, no. 7 (1991): 695-700.

Harper, Garry, et al. "Steric Stabilization of Microspheres With Grafted Polyethylene Oxide Reduces Phagocytosis By Rat Kupffer Cells in Vitro." Biomaterials 12.7 (1991): 695-700.