Christian Müller Barbara Großmann-Hutter Anthony Jameson Ralf Rummer Frank Wittig Recognizing Time Pressure and Cognitive Load on the Basis of Speech: An Experimental Study. 24-33 2001 conf/um/2001 User Modeling http://link.springer.de/link/service/series/0558/bibs/2109/21090024.htm db/conf/um/um2001.html#MullerGJRW01