Sitompul, Johnner, Rizky Insyani, Daniel Prasetyo, Hermawan Prajitno, and Hyung Woo Lee. 2016. “Improvement of Properties of Poly(L-Lactic Acid) through Solution Blending of Biodegradable Polymers”. Journal of Engineering and Technological Sciences 48 (4):430-41. https://doi.org/10.5614/j.eng.technol.sci.2016.48.4.5.