The courier [elektronický zdroj]. Brussels, Belgium : [European Commission]. Available on Internet: <http://sfx.jib.cz/sfxlcl3??url_ver=Z39.88-2004&ctx_ver=Z39.88-2004&ctx_enc=info:ofi/enc:UTF-8&rfr_id=info:sid/sfxit.com:opac_856&url_ctx_fmt=info:ofi/fmt:kev:mtx:ctx&sfx.ignore_date_threshold=1&rft.object_id=1000000000525881&svc_val_fmt=info:ofi/fmt:kev:mtx:sch_svc&> ISSN 1784-682X.