Granulicella arctica sp. nov., Granulicella mallensis sp. nov., Granulicella tundricola sp. nov. and Granulicella sapmiensis sp. nov., novel acidobacteria from tundra soil - Männistö, M.K.; Rawat, S.; Starovoytov, V.; Häggblom, M.M. (GB, 2012)