1. Hydrophilic gels in biologic use;Wichterle;Nature,1960
2. Covalent binding of biomolecules to radiation-grafted hydrogels on inert polymer surfaces;Hoffman;Trans. Am. Soc. Artif. Intern. Organs,1972
3. Synthetic hydrogels for biomedical applications;Ratner,1976
4. Biodegradable Hydrogels for Drug Delivery,1993