Lectures on partial differential equations 2026-02-15T22:44:54+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Arnold, V. I. (Vladimir Igorevich), 1937-2010 (Universitext, 2004)