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The item you are trying to access was a duplicate of:
Bennet, D.B. and Li, X. and Adams, N.W. and Kim, S.W. and Hoes, C.J.T. and Feijen, J. (1991) Biodegradable polymeric prodrugs of naltrexone. Journal of Controlled Release, 16 (1-2). pp. 43-52. ISSN 0168-3659