Invitation to discrete mathematics 2026-02-16T21:59:51+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Matousek, Jiri, 1963-; Nesetril, Jaroslav (Oxford University Press, 2009)