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The 7 references without a DOI — listed, not checked
no DOI — not checkedCommodity plastics, Chem. Eng. News (1998) 15–24.
no DOI — not checkedP.R. Gruber, M.H. Hartmann, J.J. Kolstad, D.R. Witzke, A.L. Brosch, Viscosity-modified lactide polymer composition and process for manufacture thereof, US Patent 5,594,095 (1997).
no DOI — not checkedS. Pauly, Permeability and diffusion data, in: J. Brandrup, E.H. Immergut, E.A. Grulke (Eds.), Polymer Handbook, 4th Edition, Wiley, New York, 1999, pp. 543–569.
no DOI — not checkedGE Plastics, Thermoplastic Material Properties, 2000 (www.geplastics.com).
no DOI — not checkedEconomics of gas separation membranes
no DOI — not checkedR.E. Kesting, Synthetic Polymeric Membranes, McGraw-Hill, New York, 1971.
no DOI — not checkedD.R. Witzke, Introduction to Properties, Engineering, and Prospects of Polylactide Polymers, Ph.D. Thesis, Michigan State University, East Lansing, MI, 1997.
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