@article{10_21136_CMJ_1980_101681,
     author = {Zelinka, Bohdan},
     title = {Join graphs of trees},
     journal = {Czechoslovak Mathematical Journal},
     pages = {332--335},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1980},
     doi = {10.21136/CMJ.1980.101681},
     mrnumber = {566056},
     zbl = {0419.05018},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1980.101681/}
}