T. Do, и D. Gatica-Perez. Proceedings of the 9th International Conference on Mobile and Ubiquitous Multimedia (MUM '10), Limassol, Cyprus, стр. 27:1-27:10. ACM, (2010)
P. Ehlen, M. Johnston, и G. Vasireddy. Proceedings of ICSLP---Interspeech 2002: 7th International Conference on Spoken Language Processing, Denver, CO, USA, стр. 2557-2560. (2002)