Terence R. Smith Marcia Lei Zeng Olga Agapova Olha A. Buchel Michael Freeston James Frew Linda L. Hill Laura Smart Tim Tierney Alex Ushakov Structured models of scientific concepts for organizing, accessing, and using learning materials. 407 2002 conf/jcdl/2002 JCDL http://doi.acm.org/10.1145/544220.544355 db/conf/jcdl/jcdl2002.html#SmithZABFFHSTU02