Mathematical analysis for economists 2026-02-15T21:00:29+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Allen, R. G. D. (Roy George Douglas) (A.I.T.B.S. Publ., 2008)