Henze, K., Horner, D.S., Suguri, S., Moore, D.V., Sanchez, L.B., Muller, M., Embley, T.M. (2001)Unique phylogenetic relationships of glucokinase and glucosephosphate isomerase of the amitochondriate eukaryotes Giardia intestinalis, Spironucleus barkhanus and Trichomonas vaginalis, Gene. , 281(1-2), pp. 123-31.