Kurisawa M, Chung JE, Yang YY, Gao SJ, Uyama H. Injectable biodegradable hydrogels composed of hyaluronic acid-tyramine conjugates for drug delivery and tissue engineering. Chem Commun (Camb). 2005 Sep 14;(34):4312–4. doi: 10.1039/b506989k. PMID: 16113732.