I. Marenzi, S. Zerr, F. Abel, and W. Nejdl. International Journal of Continuing Engineering Education and Life-Long Learning (IJCEELL), 19 (4/5/6):
276-290(2009)
F. Magoulès, A. Cheik Ahamed, and R. Putanowicz. Pollack Periodica, An International Journal for Engineering and Information Sciences, Akadémiai Kiadó, 10 (1):
3-18(April 2015)