Plant systematics for the 21st century  proceeding from a symposium held at the Wenner-Gren Centre, Stockholm, in September 1998 
edited by B. Nordenstam, G. El 
 - Ghazaly; M. Kassas. London  Portland  2000 
 - xiii, 366p. 
 - (Wenner Gren International series; v.77). .
<br/><br/><label>ISBN: </label>1-85578-135-2. 
<br/><br/><label>Dewey Class. No.: </label>581.012  / P62P