Arcana, M., B. Tanajaya, B. Anwar, C. L. Radiman, and M. A. Sulfikar. 2013. “Biodegradation of Poly(R,S)-β-Hydroxybutyrate and Its Copolymer With δ-Valerolactone Synthesized by Aluminoxane Catalyst”. Journal of Mathematical and Fundamental Sciences 37 (2):93-100. https://doi.org/10.5614/itbj.sci.2005.37.2.1.