Tristan Roussillon Laure Tougne Isabelle Sivignon On Three Constrained Versions of the Digital Circular Arc Recognition Problem. 34-45 2009 DGCI http://dx.doi.org/10.1007/978-3-642-04397-0_4 conf/dgci/2009 db/conf/dgci/dgci2009.html#RoussillonTS09