@article{10_21136_CPM_1988_118341,
     author = {Kostyrko, Pavel},
     title = {On a local form of {Lobachevski's} functional equation},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {179--183},
     publisher = {mathdoc},
     volume = {113},
     number = {2},
     year = {1988},
     doi = {10.21136/CPM.1988.118341},
     mrnumber = {949043},
     zbl = {0652.39009},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1988.118341/}
}