The papers are presented in date order, with the most up to date research contained in Toby Hindson's Classification Protocols of 2010. These protocols determine whether a yew is classified Ancient, Veteran and Notable on this website.
Protocols part 1 by Toby Hindson 2010
Protocols part 2 by Toby Hindson 2010
Toby Hindson research papers 2007-2012
Andy Moir tree ring analysis - 2005