@article{10_21136_MB_1994_126165,
     author = {Zelinka, Bohdan},
     title = {Extended trees of graphs},
     journal = {Mathematica Bohemica},
     pages = {239--244},
     publisher = {mathdoc},
     volume = {119},
     number = {3},
     year = {1994},
     doi = {10.21136/MB.1994.126165},
     mrnumber = {1305527},
     zbl = {0814.05027},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/MB.1994.126165/}
}