@article{10_21136_CPM_1985_118220,
     author = {Pt\'ak, Vlastimil},
     title = {Isometries in $H^2$, generating functions and extremal problems},
     journal = {\v{C}asopis pro p\v{e}stov\'an{\'\i} matematiky},
     pages = {33--57},
     publisher = {mathdoc},
     volume = {110},
     number = {1},
     year = {1985},
     doi = {10.21136/CPM.1985.118220},
     mrnumber = {791276},
     zbl = {0572.47003},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CPM.1985.118220/}
}