1. European Polymer Journal, Volume 42, Issue 2, February 2006, Pages 468-472
Guang-Xin Chen, Hun-Sik Kim, Eung-Soo Kim and Jin-San Yoon
Synthesis of high-molecular-weight poly(l-lactic acid) through the direct condensation polymerization of l-lactic acid in bulk state
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http://dx.doi.org/10.1016/j.eurpolymj.2005.07.022M. AjiokaCorresponding, H. Suizu, C. Higuchi and T. Kashima
Aliphatic polyesters and their copolymers synthesized through direct condensation polymerization
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http://dx.doi.org/10.1016/S0141-3910(97)00165-1Sung Il Moon, Chan Woo Lee, Masatoshi Miyamoto, Yoshiharu Kimura
Melt polycondensation of L-lactic acid with Sn(II) catalysts activated by various proton acids: A direct manufacturing route to high molecular weight Poly(L-lactic acid)
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http://dx.doi.org/10.1002/(SICI)1099-0518(20000501)38:9<1673::AID-POLA33>3.0.CO;2-T