1. W. Kuhn, B. Hargitay, A. Katchalsky, and H. Eisenberg, Reversible Dilatation and Contraction by Changing the State of Ionization of High Polymer Acid Networks, Nature 165(4196): 514 (1950)
2. Y. Osada, Conversion of Chemical into Mechanical Energy by Synthetic Polymers, in:“Advances in Polymer Science82”, S. Olive and G. Henrici Olive, ed., Springer-Verlag Berlin Heidelberg (1987)
3. M. Suzuki, T. Tateishi, T. Ushida, and S. Fujishige, An Artificial Muscle of Polyvinyl Alcohol Hydrogel Composites, Biorheology, 23: 274 (1986)
4. M. Suzuki, Responsive Mechanochemical Actuator Materials by PVA Hydrogel, IUPAC CHEMRAWN VI, The Chemical Society of Japan, IB11 (1987).
5. M. Suzuki, Expansible Macromolecular Material and Porous Macromolecular Membrane, U.S.Patent, 4717800 (Jan.5,1988),4753761 (Jun.28,1988)