Questions and Answers for International Open Procedure for supply of Aerial surveillance systems in 3 lots, Publication reference No DGFSCP-INTERNATIONALSUPPLY-1 are available HERE [1].
Links
[1] http://www.ipacbc-bgtr.eu/sites/ipacbc-bgtr-105.gateway.bg/files/uploads/tenders/answers_to_questions_-dgfscp-_internationalsupply-1.pdf