“…This paper does not make an attempt to give a complete bibliography on this subject. Instead it refers to Carol Carr's annotated bibliography (Carr, 2000) of the time period of 1993-1998 and lists articles which have been published since then 2 (Ricker & Thompson, 1999;Wilk & Wiger, 2000;Murov, 2001;Ridley, 2001a;Ridley, 2001b;Zass, Braendle, & Bizzizero, 2001;O'Reilly, Wilson, & Howes, 2002;Christensen, Franzyk, Frolund, Jaroszewski, Staerk, & Vedso, 2002;Gallagher & Adams, 2002;Landolt, 2002;Jackson, 2002;Porter, Lee, & Wiggins, 2002).…”