Boundary lubrication of oxide surfaces by Poly(L-lysine)-g-poly(ethylene glycol) (PLL-g-PEG) in aqueous media - Lee,S; Müller,M; Ratoi-Salagean,M; Vörös,J; Pasche,S; De,Paul SM; Spikes,HA; Textor,M; Spencer,ND (TRIBOLOGY LETTERS, 2003)