1. D.J. Connolly, W.F. Gresham, Fluorocarbon Vinyl Ether Polymers, US Patent 3,282,875 (1 November 1966).
2. R.A. Smith, Coextruded Multilayer Cation Exchange Membranes, US Patent 4,437,952 (20 March 1984).
3. C. Preischl, P. Hedrich, A. Hahn, Continuous Method for Manufacturing a Laminated Electrolyte and Electrode Assembly, US Patent 6,291,091 B1 (18 September 2001).
4. J. Kohler, K.-A. Starz, S. Wittphal, M. Diehl, Process for Producing a Membrane Electrode Assembly for Fuel Cells, US Patent 2002/0064593 A1 (30 May 2002).
5. W.G. Grot, Process for Making Liquid Composition of Perfluorinated Ion Exchange Polymer, and Product Thereof, US Patent 4,433,082 (21 February 1984).