@article{10_21136_CMJ_1976_101418,
     author = {Humke, Paul D.},
     title = {Cluster sets of arbitrary functions defined on plane sets},
     journal = {Czechoslovak Mathematical Journal},
     pages = {448--457},
     publisher = {mathdoc},
     volume = {26},
     number = {3},
     year = {1976},
     doi = {10.21136/CMJ.1976.101418},
     mrnumber = {0447579},
     zbl = {0343.04002},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1976.101418/}
}