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Simmons, N. B. and Geisler, J. H. 1998. Phylogenetic relationships of Icaronycteris, Archaeonycteris, Hassianycteris, and Palaeochiropteryx to extant bat lineages, with comments on the evolution of echolocation and foraging strategies in Microchiroptera. Bulletin of the American Museum of Natural History. Vol. 235, pp. 1-182.
Simmons, N. S. and Geisler, J. H. 2002. Sensitivity analysis of different methods of coding taxonomic polymorphism: an example from higher-level bat phylogeny. Cladistics. Vol. 18, pp. 571-584.
Gunnell, G. F. and Simmons, N. B. 2005. Fossil evidence and the origin of bats. Journal of Mammalian Evolution. Vol. 12, pp. 209-246.
Giannini, N. P. and Simmons, N. S. 2007. Element homology and the evolution of dental formulae megachiropteran bats (Mammalia: Chiroptera: Pteropodidae). American Museum Novitates. Vol. 3559, pp. 1-22.
Simmons, N. B., Seymour, K. L. and Gunnell, G. R. 2008. Primitive Early Eocene bats from Wyoming and the evolution of flight and echolocation. Nature.