@inproceedings{Kow-ESA-04,
   title = {Fast 3-Coloring Triangle-Free Planar Graphs},
   author = {{\L}ukasz Kowalik},
   booktitle = {Proc. 12th Annual European Symposium on Algorithms (ESA 2004)},
   volume = {3221},
   editor = {Susanne Albers and Tomasz Radzik},
   series = {Lecture Notes in Computer Science},
   publisher = {Springer-Verlag},
   pages = {436--447},
   year = {2004}}