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Mobile Navigation of Network-Based Electronic Information Using Spoken Input     HALVERSON, C., JULIA, L., VOUTSAS, D., & CHEYER, A. (2004).   US Patent #6,757,718, June 29, 2004.

Navigating Network-Based Electronic Information Using Spoken Input With Multimodal Error Feedback     HALVERSON, C., JULIA, L., VOUTSAS, D., & CHEYER, A. (2004).   US Patent #6,742,021, May 25, 2004.