Hebsgaard, Martin B.; Phillips, Matthew J.; Willerslev, Eske (2005). "Geologically ancient DNA: fact or artefact?". Trends in Microbiology. 13 (5): 212–220. doi:10.1016/j.tim.2005.03.010. PMID15866038.
Hebsgaard, Martin B.; Phillips, Matthew J.; Willerslev, Eske (2005). "Geologically ancient DNA: fact or artefact?". Trends in Microbiology. 13 (5): 212–220. doi:10.1016/j.tim.2005.03.010. PMID15866038.