Alex Ushakov Papers on DiSC'03 Structured models of scientific concepts for organizing, accessing, and using learning materials Publications Note: Links lead to the DBLP on the Web. Alex Ushakov 2 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. JCDL 2002 : 407 1 David Fulker , Sharon S. Dawes , Leonid A. Kalinichenko , Tamara Sumner , Constantino Thanos , Alex Ushakov: Digital library collaborations in a world community. JCDL 2001 : 135 DiSC'03 © 2003 Association for Computing Machinery