Zachary Abel Erik D. Demaine Martin L. Demaine Takashi Horiyama Ryuhei Uehara Computational Complexity of Piano-Hinged Dissections. 1206-1212 2014 97-A IEICE Trans. Fundam. Electron. Commun. Comput. Sci. 6 https://doi.org/10.1587/transfun.E97.A.1206 http://search.ieice.org/bin/summary.php?id=e97-a_6_1206 db/journals/ieicet/ieicet97a.html#AbelDDHU14