Carlos DuarteLuís CarriçoNuno Guimarães2010-05-212014-11-142010-05-212014-11-1420072007http://hdl.handle.net/10451/15020http://repositorio.ul.pt/handle/10455/6583engComputer ScienceEvaluating Usability Improvements by Combining Visual and Audio Modalities in the Interfacejournal article