Jurek Czyzowicz Stefan Dobrev Evangelos Kranakis Jaroslav Opatrny Julià Urrutia Local edge colouring of Yao-like subgraphs of Unit Disk Graphs. 1388-1400 2009 410 Theor. Comput. Sci. 14 http://dx.doi.org/10.1016/j.tcs.2008.11.008 db/journals/tcs/tcs410.html#CzyzowiczDKOU09