D. Seebach, A. K. Beck, U. Brändli, D. Müller, M. Przybylski, and K. Schneider, “Partial Depolymerization and Solubilization of Poly[(R)-3-hydroxybutanoate] (PHB) and Its Copolymer with (R)-3-Hydroxyvalerate (BIOPOL®) by Treatment with Li-Amides/LiCl in Tetrahydrofuran at Low Temperature”, Chimia, vol. 44, no. 5, p. 112, May 1990.