Boesel L. F., Azevedo H. S., and Reis R. L.,  "Incorporation of a-amylase enzyme and a bioactive filler into hydrophilic, partially degradable and bioactive cements (HDBCs) as a new approach to tailor their simultaneous degradation and bioactive behavior",  Biomacromolecules, vol. 7, pp. 2600-2609, 2006.