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Forest, F.; Savolainen, V.; Chase, M. W.; Lupia, R.; Bruneau, A.; Crane, P. R. (2005). „Teasing apart molecular-versus fossil-based error estimates when dating phylogenetic trees: a case study in the birch family (Betulaceae)”. Systematic Botany. 30 (1): 118—133. S2CID86080433. doi:10.1600/0363644053661850.