Laura Hoffmann Nicole C. Krämer Anh Lam-chi Stefan Kopp Media Equation Revisited: Do Users Show Polite Reactions towards an Embodied Agent? 159-165 2009 IVA http://dx.doi.org/10.1007/978-3-642-04380-2_19 conf/iva/2009 db/conf/iva/iva2009.html#HoffmannKLK09