homepages/134/4863,
Wolfram H. Wellssow and Wolfram H. Wellßow, Home Page, http://www.eit.uni-kl.de/esem/mitarbeiter/prof-dr-ing-wolfram-h-wellssow/, University of Kaiserslautern
homepages/134/9673,
Harriët H. Mulder and Harriët Wilhelmina Mulder, Home Page, http://www.isi.uu.nl/People/?harriet, VU University Medical Center Amsterdam
homepages/90/377-1,
Balasubramaniam Srinivasan and Bala Srinivasan, Home Page, http://la.epfl.ch/page-52934-en.html, Ecole Polytechnique Fédérale de Lausanne, Switzerland
homepages/64/5215,
Richard E. Ferdig and Rick Ferdig, Home Page, http://www.ferdig.com/, Research Center for Educational Technology, Kent State University, Kent, OH, USA
homepages/90/1843,
James W. Mickens, Home Page, http://research.microsoft.com/en-us/people/mickens/, University of Michigan, Electrical and Computer Engineering Division