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4. Sawhney, A. S.; Jarrett, P. K.; Coury, A. J.; Rudowsky, R. S.; Powell, M. D.; Avila, L. Z.; Enscore, D. J.; Goodrich, S. D.; Nason, W. C.; Yao, F.; Weaver, D.; Barman, S. P.; Lyman, M. D.Increasing elasticity of hydrophilic polymer gel as e.g., tissue adhesive, coating or sealant, comprises addition of carbonate linkages into polymer. US 6,177,095, 2001.