@article{AUPO_1988__27_1_a21,
     author = {Lison\v{e}k, Petr},
     title = {Heuristic search algorithms on directed trees},
     journal = {Acta Universitatis Palackianae Olomucensis. Facultas Rerum Naturalium. Mathematica},
     pages = {347--354},
     publisher = {mathdoc},
     volume = {27},
     number = {1},
     year = {1988},
     mrnumber = {1039900},
     zbl = {0691.68074},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AUPO_1988__27_1_a21/}
}