Principles of direct-current electrical engineering 2026-02-15T09:59:06+03:00 DEBUG: VuFind\ILS\Driver\Folio: Token taken from global cache: eyJhbGciOiJIUzI1NiJ9.eyJzdWIiO... - Barr, James R (Methuen, Milton Keynes, Open University Press, 2011)