102. Rudolph C, Schillinger U, Plank C, et al. Nonviral gene delivery to the lung with copolymer-protected and transferrin-modified polyethylenimine. Biochim Biophys Acta. 2002;1573:75–83. 103. Li SD, Huang L. Surface-modified LPD nanoparticles for tumor targeting. Ann N Y Acad Sci. ...