@article{10_14708_cm_v20i1_5887,
     author = {M. Karpi\'nski},
     title = {Equivalence results on probabilistic tree languages},
     journal = {Commentationes Mathematicae},
     pages = { 111--131},
     publisher = {mathdoc},
     volume = {20},
     number = {1},
     year = {1977},
     doi = {10.14708/cm.v20i1.5887},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v20i1.5887/}
}