@article{MZ_1966__91_170514,
     author = {J.E. McMillan},
     title = {Principal {Cluster} {Values} of {Continuous} {Functions.}},
     journal = {Mathematische Zeitschrift},
     pages = {186--197},
     publisher = {mathdoc},
     volume = {91},
     year = {1966},
     zbl = {0136.06202},
     url = {http://geodesic.mathdoc.fr/item/MZ_1966__91_170514/}
}