Jean-Pierre Duval Roman Kolpakov Gregory Kucherov Thierry Lecroq Arnaud Lefebvre Linear-Time Computation of Local Periods. 388-397 http://springerlink.metapress.com/openurl.asp?genre=article&issn=0302-9743&volume=2747&spage=388 2003 conf/mfcs/2003 MFCS db/conf/mfcs/mfcs2003.html#DuvalKKLL03