@article{10_14708_cm_v17i2_5794,
     author = {A. Szybiak},
     title = {Intrinsic construction of the metric in the model of {Poincar\'e} of hyperbolic planimetry},
     journal = {Commentationes Mathematicae},
     pages = { 481--487},
     publisher = {mathdoc},
     volume = {17},
     number = {2},
     year = {1974},
     doi = {10.14708/cm.v17i2.5794},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v17i2.5794/}
}