Aziz, M. S. A., H. F. Naguib, S. M. Sherif, and G. R. Saad,  "Preparation and Characterization of Biodegradable Polyurethane Nanocomposites Based on Poly(3-hydroxybutyrate) and Poly(Butylene Adipate) Using Reactive Organoclay",  Polymer - Plastics Technology and Engineering, vol. 53, issue 16, pp. 1671 - 1681, 2014.