@article {
Johnson-1998-IPA,
author= "W.L. Johnson, J. Rickel, R. Stiles, A. Munro",
title= "Integrating Pedagogical Agents into Virtual Environments",
journal= "Teleoperators and Virtual Environments",
year= "1998",
month= "Dec",
volume= "7",
pages= "523--546",
}