Takehiro Ito Erik D. Demaine Nicholas J. A. Harvey Christos H. Papadimitriou Martha Sideri Ryuhei Uehara Yushi Uno On the Complexity of Reconfiguration Problems. 28-39 2008 ISAAC http://dx.doi.org/10.1007/978-3-540-92182-0_6 conf/isaac/2008 db/conf/isaac/isaac2008.html#ItoDHPSUU08