Hee-Kap Ahn Mohammad Farshi Christian Knauer Michiel H. M. Smid Yajun Wang Dilation-Optimal Edge Deletion in Polygonal Cycles. 69-87 2010 20 Int. J. Comput. Geom. Appl. 1 https://doi.org/10.1142/S0218195910003207 db/journals/ijcga/ijcga20.html#AhnFKSW10