1. ‘Anionic polymeric drugs’ (Ed, by L.G. Donaruma, R.M. Ottenbrite, and O. Vogl) 1980: New York. Wiley-Interscience.
2. R.N. Ottenbrite et al. in ‘Polymeric Drugs’ (Ed. by L.G. Donaruma and O. Vogl), 1978:New York. Academic Press, p.263.
3. D.S. Breslow, E.I. Edwards, and N.R. Newbury, Nature, 1973, 246, 160.
4. M.C. Breinig et al., in Ref.1, p.211.
5. A.M. Kaplin, in Ref.1, p.227.