id: 70771594 dt: a an: 70771594 au: Crozat, Stéphane; Trigano, Philippe ti: An ontological approach for design and evaluation of tutoring systems so: Intelligent Tutoring Systems, 651 (2000). py: 2000 pu: la: EN cc: ut: ci: li: doi:10.1007/3-540-45108-0_74