H. - K.  Moon, Vinckier, S., Smets, E., and Huysmans, S., ?Comparative pollen morphology and ultrastructure of Mentheae subtribe Nepetinae (Lamiaceae)?, Rev Palaeobot Palyno, vol. 149, pp. 174?186, 2008.

H. - K.  Moon, Vinckier, S., Walker, J. B., Smets, E., and Huysmans, S., ?A search for phylogenetically informative pollen characters in the subtribe Salviinae (Mentheae : Lamiaceae)?, International Journal of Plant Sciences, vol. 169, pp. 455?471, 2008.

H. - K.  Moon, Vinckier, S., Smets, E., and Huysmans, S., ?Palynological evolutionary trends within the tribe Mentheae with special emphasis on subtribe Menthinae (Nepetoideae: Lamiaceae)?, Plant Systematics and Evolution, vol. 275, pp. 93?108, 2008.