Maszenan AM, Burghardt J, Stratton HM, Patel BK, Seviour RJ, Schumann P, Tokiwa Y
(2000).
Three isolates of novel polyphosphate-accumulating gram-positive cocci, obtained from activated sludge, belong to a new genus, Tetrasphaera gen. nov., and description of two new species, Tetrasphaera japonica sp. nov. and Tetrasphaera australiensis sp. nov.