Mark Nicholson 0002 Paul Vickers Pen-Based Gestures: An Approach to Reducing Screen Clutter in Mobile Computing. 320-324 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=3160&spage=320 2004 conf/mhci/2004 Mobile HCI db/conf/mhci/mhci2004.html#NicholsonV04