1. Lonsdale, H.K., 1982: “The growth of membrane technology.” J. Membrane Sci. 10, 81.
2. Metzger, H., Kock, K., Dt. Pat. 1769595.
3. Kammermeyer, K, 1968: “Gas and vapor separations by means of membranes,” in “Progress in Separation and Purification,” Perry E.S. (ed.), New York, Wiley-Interscience, Volume 1.
4. Gore, R.W., 1967: “Very highly stretched polytetrafluoroethylene and process therefor.” U.S. Patent 3962153.
5. Fleischner, R.L., Price, P.B., and Walker, R.M., 1969: “Nuclear tracks in solids.” Sci. Amer. 220, 30.