https://www.universitycube.net/urlref/http%3A%2F%2Fmeridian.allenpress.com%2Faplm%2Farticle-pdf%2F129%2F8%2F984%2F2757902%2F1543-2165(2005)129%25255b984_naptpr%25255d2_0_co_2.pdf