Sobolev spaces 2026-02-15T21:48:08+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Adams, R. A. (Robert Alexander), 1940-; Fournier, John J. F (Pure and applied mathematics ;, 2003)