K.  Suetsugu, Suleiman, M., and Tsukaya, H., ?A new species of Gastrodia (Gastrodieae, Epidendroideae, Orchidaceae) from the Maliau Basin Conservation Area, Sabah, Borneo?, Phytotaxa, vol. 367, pp. 78 - 84, 2018.

K.  Suetsugu, Suleiman, M., and Tsukaya, H., ?A new variety of the mycoheterotrophic orchid Didymoplexis obreniformis (Orchidaceae) from Borne, Malaysia?, Acta Phytotax. Geobot., vol. 68(2), pp. 105 - 109, 2017.

K.  Suetsugu, Kikuchi, A. B. I. S., Suleiman, M., and Tsukaya, H., ?New distributional records for the mycoheterotrophic orchid Kalimantanorchis nagamasui from Sabah, Borneo, Malaysia?, Acta Phytotax. Geobot., vol. 68(2), pp. 117 - 121, 2017.

K.  Suetsugu, Suleiman, M., Anthony, F., and Tsukaya, H., ?Aphyllorchis maliauensis (Orchidaceae), a new species from the Maliau Basin, Sabah, Borneo?, Phytotaxa, vol. 367(1), pp. 85 - 90, 2018.

H.  Tsukaya, Suetsugu, K., and Suleiman, M., ?Thismia bryndonii (Thismiaceae), a new species from Maliau Basin, Sabah, Borneo?, Phytotaxa, vol. 312(1), pp. 135 - 138, 2017.

K.  Suetsugu, Suleiman, M., and Tsukaya, H., ?A new species of Gastrodia (Gastrodieae, Epidendroideae, Orchidaceae) from the Maliau Basin Conservation Area, Sabah, Borneo?, Phytotaxa, vol. 367(1), pp. 78 - 84, 2018.

H.  Tsukaya, Suleiman, M., and Okada, H., ?Didymoplexiella trichechus (J.J.Sm.) Garay and a new variety of Didymoplexis cornuta J.J.Sm. (Orchidaceae) in Borneo?, Acta Phytotax, vol. 62 (2), pp. 105 - 110, 2014.

H.  Tsukaya, Suleiman, M., and Okada, H., ?A new species of Epirixanthes (Polygalaceae) from Imbak Canyon, Sabah, Borneo?, Phytotaxa, vol. 266 (2), pp. 146 - 150, 2016.

H.  Tsukaya, Suleiman, M., and Okada, H., ?A new variety of Thismia hexagona Dan?ák, Hrone?, Koblová et Sochor (Thismiaceae) from Sabah, Borneo, Malaysia?, Acta Phytotax. Geobot., vol. 65, no. 3, pp. 141-145, 2014.