Arthur Flexer Georg Dorffner Peter Sykacek Iead Rezek An Automatic, Continuous and Probabilistic Sleep Stager Based on a Hidden Markov Model. 199-207 2002 16 Applied Artificial Intelligence 3 db/journals/aai/aai16.html#FlexerandDSR02 http://taylorandfrancis.metapress.com/openurl.asp?genre=article&issn=0883-9514&volume=16&issue=3&spage=199