Author index (Volume 20).

The document is an author index for Volume 20 of the Journal of Hyperbolic Differential Equations. It lists the authors and titles of articles published in the volume, along with the page numbers and publication dates. The articles cover a range of topics in hyperbolic differential equations, including wave equations, conservation laws, and fluid dynamics. The index provides a useful resource for library patrons conducting research in these areas. [Extracted from the article]