[Bulgarian Nuclear Regulatory Agency. (2016). Annual report of 2015, Sofia: Bulgarian nuclear regulatory agency, available at: http://www.bnra.bg/en/documents-en/annrep/anrepeng-2015.]Search in Google Scholar
[The Council of Ministers. (2011). National programme on disaster the 2014 -2018, Sofia: the Council of Ministers.]Search in Google Scholar
[The Council of Ministers. (2013). National report on the status and protection of the environment in Bulgaria in 2012 of the EEA, Sofia: The Council of Ministers.]Search in Google Scholar
[The Council of Ministers. (2014), National report on the status and protection of the environment in Bulgaria in 2013 of the EEA, Sofia: The Council of Ministers.]Search in Google Scholar
[Dolchinkov, N.T. & Nichev, N.B. (2016). Characteristics of radiation, Revista Academiei Forţelor Terestre, No. 2 (82).]Search in Google Scholar
[Dolchinkov, N.T. (2016). Historical overview and analysis of national automated system for continuous mon itoring of gamma radiation, VIII научно-практического семинара Eкономічна безпека держави і науково-технологічні aспекти її забезпечення, Кiiв.]Search in Google Scholar
[Executive Environment Agency. (2017). National report on the status and protection of the environment 2013 in the Republic of Bulgaria, available at: http://translate.google.com/translate?u=http%3A%2F%2Feea.government.bg%2Fbg%2Fsoer%2F2014&langpair=auto|en&hl=en.]Search in Google Scholar
[Ministry of Environment and Water of Bulgaria. (2016). National report on the Status and protection of the environment 2014 in the Republic of Bulgaria, available at: http://www5.moew.government.bg/?page_id=44647.]Search in Google Scholar
[Pivovarova, Yu. & Mikhalev, V. (2004). Radiation ecology, Moscow. Academy.]Search in Google Scholar
[Vasilev, D. (2015). Radioecology, Sofia. Titus Consult.]Search in Google Scholar
