@article{10_4064_ap_30_2_191_203,
     author = {Z. Kominek},
     title = {$C^r$-solutions of a system of functional equations},
     journal = {Annales Polonici Mathematici},
     pages = {191--203},
     publisher = {mathdoc},
     volume = {30},
     number = {2},
     year = {1974},
     doi = {10.4064/ap-30-2-191-203},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-30-2-191-203/}
}