[1] The Water Act, promulgated in State Gazette No 67 of 27 July 1999, in force since 28 January 2000, last amended in State Gazette No 61 of 11 August 2015.
[2] Constitution of the Republic of Bulgaria, promulgated in State Gazette No56/1991, in force since 13 July 1991, amended and supplemented in State Gazette No 85/2003, amended and supplemented in State Gazette No 18/2005, SG No 27/2006, State Gazette No.78/2006 – Decision No 7 of the Constitutional Court of 2006, State Gazette No 12/2007.
[5] Ehrlich, P.R.; Ehrlich, A.H. Extinction: the causes and consequences of the disappearance of the species. First edition. Random House, New York, 1981, p. 305.
[6] Ordinance No 3 of 16 October 2000 on the conditions and procedure for the exploration, design, approval and exploitation of sanitary protection zones around water sources and facilities for drinking and domestic purposes and around mineral water sources used for medical, prophylactic, drinking and hygiene purposes, promulgated in State Gazette No 88 of 27 October 2000.
[7] Ordinance No 20 of 18 November 2016 on the content, conditions and procedure for the production and maintenance of forestry maps, promulgated in State Gazette No 95 of 29 November 2016.
[9] Act on the Administrative and Territorial Structure of the Republic of Bulgaria, promulgated in State Gazette No 63 of 14 July 1995, amended in State Gazette No 58 of 18 July 2017.
[10] Regulation (EC) No 1059/2003 of the European Parliament and of the Council of 26 May 2003 on the establishment of a common classification of territorial units for statistical purposes (NUTS), Website: https://eur-lex.europa.eu/legal-content/BG/TXT/HTML/?uri=CELEX:02003R1059-20180118&from=EN.
[11] Milchev, R.; Myashkov, I. A study of the possibilities for the application of GIS for the more effective elaboration of multifunctional forest management plans. Management and Sustainable Development, 2004, 3-4, 229-233.
[12] Asenova, М.; Milchev, R. A study of the approaches to constructing GIS user interfaces for forests. Proceedings of the 12th International Scientific Conference “Management and Engineering”, Sozopol, 2014, 581-590.
[13] Cioloboc, F.-D. What are the Top Programming Languages in the GIS World? 2016. Website: https://gogeomatics.ca/what-are-the-top-programming-languages-in-the-gis-world/.
[14] Microsoft Corp. Getting started with VBA in Office. 2019. Website: https://docs.microsoft.com/enus/office/vba/library-reference/concepts/getting-started-with-vba-in-office.