@article{10_4064_ap_20_2_153_165,
     author = {J. {\L}awrynowicz},
     title = {On certain functional equations for quasiconformal mappings},
     journal = {Annales Polonici Mathematici},
     pages = {153--165},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1968},
     doi = {10.4064/ap-20-2-153-165},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-20-2-153-165/}
}