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The application of a molecular clock based on molecular sequences and the fossil record to explain biogeographic distributions
within the Alexandrium tamarense "species complex" (Dinophyceae); John, U; Fensome, R A; Medlin, L. Molecular Biology and
Evolution vol. 20, no. 7, 2003 p. 1015-1027,
https://doi.org/10.1093/molbev/msg105 
Open Access (GSC
Cont.# 2002166)