Links
[1] http://www.ipacbc-bgtr.eu/sites/ipacbc-bgtr-105.gateway.bg/files/uploads/documents/annex_9_1_air_2016_bg-tr_final.pdf
[2] http://www.ipacbc-bgtr.eu/sites/ipacbc-bgtr-105.gateway.bg/files/uploads/documents/air_2016_citizens_summary_bg_tr.pdf