@article{ARM_1968_4_2_a1,
     author = {Zelinka, Bohdan},
     title = {Medians and peripherians of trees},
     journal = {Archivum mathematicum},
     pages = {87--95},
     year = {1968},
     volume = {4},
     number = {2},
     mrnumber = {0269541},
     zbl = {0206.26105},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ARM_1968_4_2_a1/}
}