Journal article (1998) - J Zhao (author), R Abegg (author), DC Healey (author), L Lee (author), E Korkmaz (author), N Kolb (author), CDP Levy (author), J. Li (author), CA Miller (author), SA Page (author), R Helmer (author), AK Opper (author), AR Berdoz (author), H Postma (author), WD Ramsay (author), J Soukop (author), GM Stinson (author), WTH van Oers (author), AN Zelenski (author), J Birchall (author), JR Campbell (author), CA Davis (author), PPJ Delheij (author), L Gan (author), LG Green (author), LG Greeniaus (author)