1. Martindale: The Extra Pharmacopoeia,1982
2. USAN and the USP Dictionary of Drug Names,1988
3. Hyaluronic acid esters and their medical and cosmetic uses and formulations;Della Valle,11987
4. Personal communication, Fidia S.p.A., 1987.
5. Physical Pharmacy: Physical Chemical Principles in the Pharmaceutical Sciences;Martin,1983