Jarkko Vartiainen Albert Sadovnikov Joni-Kristian Kamarainen Lasse Lensu Heikki Kälviäinen Detection of irregularities in regular patterns. 249-259 2008 19 Mach. Vis. Appl. 4 http://dx.doi.org/10.1007/s00138-007-0096-9 db/journals/mva/mva19.html#VartiainenSKLK08