@article{CMUC_1985__26_2_a5,
     author = {Loebl, Martin},
     title = {Hercules and {Hydra,} a game on rooted finite trees},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {259--267},
     publisher = {mathdoc},
     volume = {26},
     number = {2},
     year = {1985},
     mrnumber = {803922},
     zbl = {0565.90090},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1985__26_2_a5/}
}