@inproceedings{KowKur-STOC-03,
   title = {Short path queries in planar graphs in constant time},
   author = {{\L}ukasz Kowalik and Maciej Kurowski},
   booktitle = {Proc. 35th Symp. Theory of Computing},
   publisher = {ACM},
   pages = {143--148},
   month = {Jun},
   year = {2003}}