Jukka Riekki Pekka Isomursu Minna Isomursu Evaluating the Calmness of Ubiquitous Applications. 105-119 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3009&spage=105 2004 conf/profes/2004 PROFES db/conf/profes/profes2004.html#RiekkiII04