Cristiano Calcagno Dino Distefano Peter W. O'Hearn Hongseok Yang Space Invading Systems Code. 1-3 2008 LOPSTR http://dx.doi.org/10.1007/978-3-642-00515-2_1 conf/lopstr/2008 db/conf/lopstr/lopstr2008.html#CalcagnoDOY08