الإتاحة: http://vddb.library.lt/fedora/get/LT-eLABa-0001:E.02~2014~D_20140305_134142-67186/DS.005.0.01.ETDTest
الوصول الحر: https://explore.openaire.eu/search/publication?articleId=dedup_wf_001::6638ad6c4c7ecd36ba51d8b2157a6c8bTesthttp://vddb.library.lt/fedora/get/LT-eLABa-0001:E.02~2014~D_20140305_134142-67186/DS.005.0.01.ETDTest