H.  Tsukaya, Nakajima, M., and Okada, H., ?Didymoplexiella cinnabarina (Orchidaceae): a new species from Muller Range, Central Kalimantan, Indonesia?, Acta Phytotax. Geobot., vol. 56(3), pp. 207 - 212, 2005.

H.  Tsukaya and Okada, H., ?Thismia mullerensis (Burmanniaceae), a new species  from Muller Range, central Kalimantan?, Acta Phytotax. Geobot., vol. 56(2), pp. 129 - 133, 2005.