The finite element method and its reliability 2026-02-16T03:17:27+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Babuska, Ivo; Strouboulis, Theofanis (Numerical mathematics and scientific computation, 2001)