@incollection{
 author = {Niewiadomski, R. and Mancini, M. and Hyniewska, S. and Pelachaud, C.},
 title = {Communicating emotional states with the Greta agent},
 booktitle = {A Blueprint for Affective Computing: A sourcebook},
 editor = {Scherer, K.R. and Banziger, T. and Roesch, E.},
 year = {2010},
 pages = {256--268},
 publisher = {Oxford: Oxford University Press}
}