Schibler, U.; Wyler, T.; Hagenbuchle, O. (1975). «Changes in size and secondary structure of the ribosomal transcription unit during vertebrate evolution». Journal of Molecular Biology94 (3): 503-17. PMID809590. doi:10.1016/0022-2836(75)90217-X.
Baldwin, B.G.; Markos, S. (1998). «Phylogenetic utility of the external transcribed spacer (ETS) of 18S-26S rDNA: Congruence of ETS and ITS trees of Calycadenia (Compositae)». Molecular Phylogenetics and Evolution10 (3): 449-63. PMID10051397. doi:10.1006/mpev.1998.0545.
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Schibler, U.; Wyler, T.; Hagenbuchle, O. (1975). «Changes in size and secondary structure of the ribosomal transcription unit during vertebrate evolution». Journal of Molecular Biology94 (3): 503-17. PMID809590. doi:10.1016/0022-2836(75)90217-X.
Baldwin, B.G.; Markos, S. (1998). «Phylogenetic utility of the external transcribed spacer (ETS) of 18S-26S rDNA: Congruence of ETS and ITS trees of Calycadenia (Compositae)». Molecular Phylogenetics and Evolution10 (3): 449-63. PMID10051397. doi:10.1006/mpev.1998.0545.