@article {foster-oberlander-umuai2010,
   author = {Foster, Mary Ellen and Oberlander, Jon},
   title = {User preferences can drive facial expressions: evaluating an embodied conversational agent in a recommender dialogue system},
   journal = {User Modeling and User-Adapted Interaction},
   pages = {341--381},
   volume = 20,
   issue = 4,
   month = oct,
   doi = {10.1007/s11257-010-9080-6},
   year = 2010
}