<h1>Fokas, Athanassios S.</h1> <h2>Article from <a href="https://data.caltech.edu">CaltechTHESIS</a></h2> <ul> <li>Fokas, Athanassios S. (1979) <a href="https://resolver.caltech.edu/CaltechTHESIS:03212013-111445922">Invariants, Lie-Bäcklund operators and Bäcklund transformations</a>; <a href="https://doi.org/10.7907/A8EZ-HA03">10.7907/A8EZ-HA03</a></li> </ul>