Vanessa M. Adams et al., Importance of the seed bank for population viability and population monitoring in a threatened wetland herb, Lexington, Washington and Lee University, luglio 2004 abstract dell'e-bookArchiviato il 21 agosto 2008 in Internet Archive.
Vanessa M. Adams et al., Importance of the seed bank for population viability and population monitoring in a threatened wetland herb, Lexington, Washington and Lee University, luglio 2004 abstract dell'e-bookArchiviato il 21 agosto 2008 in Internet Archive.