Differential equations with boundary-value problems 2026-02-15T21:47:21+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Zill, Dennis G., 1940-; Cullen, Michael R. (Brooks/Cole Pub. Co., 1997)