@article{10_4064_cm89_1_10,
     author = {Piroska Lakatos},
     title = {Additive functions on trees},
     journal = {Colloquium Mathematicum},
     pages = {135--145},
     publisher = {mathdoc},
     volume = {89},
     number = {1},
     year = {2001},
     doi = {10.4064/cm89-1-10},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm89-1-10/}
}