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Adl SM, Simpson AG, Farmer MA, Andersen RA, Anderson OR, Barta JR, et al. The new higher level classification of eukaryotes with emphasis on the taxonomy of protists. The Journal of Eukaryotic Microbiology. 2005, 52 (5): 399–451. PMID 16248873. doi:10.1111/j.1550-7408.2005.00053.x.
Ramesh MA, Malik SB, Logsdon JM. A phylogenomic inventory of meiotic genes; evidence for sex in Giardia and an early eukaryotic origin of meiosis. Current Biology. 2005-01, 15 (2): 185–191. PMID 15668177. doi:10.1016/j.cub.2005.01.003.