1. Alexandrov V, Slavov N (2004) Drought impacts on crops. In: CG Knight, I Raev and MP Staneva (eds) Drought in Bulgaria: A Contemporary Analog of Climate Change, Ashgate Press, Aldershot, UK, pp. 157–170.
2. Bakalov I (2008) Hydro Diversion Protest of 1989.
http://e-vestnik.bg/4944
(accessed 10/24/2009)
3. Blue Link (2005) Green Peace Exhibit “Energy Revolution: 2005”.
http://bluelink.net/climate/nfp.shtml?x=7194
(accessed 10/24/2009)
4. Blue Link (2007) Climate Action Bulgaria – 2007.
http://www.bluelink.net/climate/nfp.shtml?x=26263
(accessed 10/24/2009)
5. Blue Link (2008) Alternative energy in Bulgaria: Solar and wind.
http://www.bluelink.net/climate/nfp.shtml?x=37859
(accessed 10/24/2009)