Olle Bälter Olov Engwall Anne-Marie Öster Hedvig Kjellström Wizard-of-Oz test of ARTUR: a computer-based speech training system with articulation correction. 36-43 2005 conf/assets/2005 ASSETS http://doi.acm.org/10.1145/1090785.1090795 db/conf/assets/assets2005.html#BalterEOK05