Spatial planning of biogas stations in EstoniaPiirimäe, Kristjan; Blonskaja, Viktoria; Loigu, EnnThe 9th International Conference "Environmental Engineering" : 22-23 May 2014, Vilnius, Lithuania : selected papers2014 / p. 1-6 : ill The analysis of biodegradable waste as renewable resource for alternative energy production in EstoniaBlonskaja, ViktoriaEkologija2014 / p. 27-37 : ill