(2002. január 24.) „Sulfolobus tokodaii sp. nov. (f. Sulfolobus sp. strain 7), a new member of the genus Sulfolobus isolated from Beppu Hot Springs, Japan”. Extremophiles6 (1), 39–44. o. DOI:10.1007/s007920100221. ISSN1431-0651.
(2002. január 24.) „Sulfolobus tokodaii sp. nov. (f. Sulfolobus sp. strain 7), a new member of the genus Sulfolobus isolated from Beppu Hot Springs, Japan”. Extremophiles6 (1), 39–44. o. DOI:10.1007/s007920100221. ISSN1431-0651.