Rai, Hardeep S. & Graham, Sean W. (2010). "Utility of a large, multigene plastid data set in inferring higher-order relationships in ferns and relatives (monilophytes)". American Journal of Botany. 97 (9): 1444–1456. Bibcode:2010AmJB...97.1444R. doi:10.3732/ajb.0900305. PMID21616899., p. 1450
Rai, Hardeep S. & Graham, Sean W. (2010). "Utility of a large, multigene plastid data set in inferring higher-order relationships in ferns and relatives (monilophytes)". American Journal of Botany. 97 (9): 1444–1456. Bibcode:2010AmJB...97.1444R. doi:10.3732/ajb.0900305. PMID21616899., p. 1450
Rai, Hardeep S. & Graham, Sean W. (2010). "Utility of a large, multigene plastid data set in inferring higher-order relationships in ferns and relatives (monilophytes)". American Journal of Botany. 97 (9): 1444–1456. Bibcode:2010AmJB...97.1444R. doi:10.3732/ajb.0900305. PMID21616899., p. 1450