%0 Journal Article %A Ruohonen, Keijo %T Undecidable event detection problems for ODEs of dimension one and two %J RAIRO - Theoretical Informatics and Applications - Informatique Théorique et Applications %D 1997 %P 67-79 %V 31 %N 1 %I EDP-Sciences %U http://archive.numdam.org/item/ITA_1997__31_1_67_0/ %G en %F ITA_1997__31_1_67_0