9Bron AJ, Mangat H, Quinlan M, et al. Polyacrylic acid gel in patients with dry eyes: a randomized comparison with polyvinyl alcohol [J]. Eur J OpHthalmol,1998, 8(2):81.
10Bromberg LE. Enhanced nasal retention of hydropHobically modified polyelectrolytes [J]. J PHarm PHarmacol, 2001,53(1):109.