S. Breitenbach, T. Burd, N. Chidambaram, E. Astrid-andersson, X. Tang et al., , 2001.

B. Lucas, VoiceXML for Web-based distributed conversational applications, Communications of the ACM, vol.43, p.9, 2000.

G. Niklfeld, R. Finan, and M. Pucher, Architecture for adaptive multimodal dialog systems based on VoiceXML, Eurospeech, 2001.