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@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/} }
J.E. McMillan. Principal Cluster Values of Continuous Functions.. Mathematische Zeitschrift, Tome 91 (1966), pp. 186-197. http://geodesic.mathdoc.fr/item/MZ_1966__91_170514/