Pikaia (Danish Wikipedia)

Analysis of information sources in references of the Wikipedia article "Pikaia" in Danish language version.

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bris.ac.uk

Donoghue, P.C.J.; Purnell, M.A. (2005), "Genome duplication, extinction and vertebrate evolution" (PDF), Trends in Ecology & Evolution (engelsk), 20 (6): 312-319, doi:10.1016/j.tree.2005.04.008, PMID 16701387, arkiveret fra originalen (PDF) 17. december 2008, hentet 17. februar 2013

Conway Morris, S. (2008), "A Redescription of a Rare Chordate, Metaspriggina walcotti Simonetta and Insom, from the Burgess Shale (Middle Cambrian), British Columbia, Canada", Journal of Paleontology (engelsk), 82 (2): 424-430, doi:10.1666/06-130.1, hentet 2009-04-28
Donoghue, P.C.J.; Purnell, M.A. (2005), "Genome duplication, extinction and vertebrate evolution" (PDF), Trends in Ecology & Evolution (engelsk), 20 (6): 312-319, doi:10.1016/j.tree.2005.04.008, PMID 16701387, arkiveret fra originalen (PDF) 17. december 2008, hentet 17. februar 2013

Butterfield, N.J. (1990), "Organic preservation of non-mineralizing organisms and the taphonomy of the Burgess Shale", Paleobiology (engelsk), Paleontological Society, 16 (3): 272-286, JSTOR 2400788

Donoghue, P.C.J.; Purnell, M.A. (2005), "Genome duplication, extinction and vertebrate evolution" (PDF), Trends in Ecology & Evolution (engelsk), 20 (6): 312-319, doi:10.1016/j.tree.2005.04.008, PMID 16701387, arkiveret fra originalen (PDF) 17. december 2008, hentet 17. februar 2013

"Pikaia gracilens" Arkiveret 24. december 2013 hos Wayback Machine Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011. (engelsk)

"Pikaia gracilens" Arkiveret 24. december 2013 hos Wayback Machine Burgess Shale Fossil Gallery. Virtual Museum of Canada. 2011. (engelsk)
Donoghue, P.C.J.; Purnell, M.A. (2005), "Genome duplication, extinction and vertebrate evolution" (PDF), Trends in Ecology & Evolution (engelsk), 20 (6): 312-319, doi:10.1016/j.tree.2005.04.008, PMID 16701387, arkiveret fra originalen (PDF) 17. december 2008, hentet 17. februar 2013