2011-09-122011-09-122011-09-12978-963-446-617-8http://hdl.handle.net/2437/111165978-963-446-617-8http://webpac.lib.unideb.hu:8082/WebPac/CorvinaWeb?action=cclfind&resultview=long&ccltext=idno+bibDEK00855316