@article{GDZPPN002397005, title = {Principal Cluster Values of Continuous Functions.}, journal = {Mathematische Zeitschrift}, volume = {93}, year = {1966}, pages = {186-197}, zbl = {0136.06202}, url = {http://dml.mathdoc.fr/item/GDZPPN002397005} }
McMillan, J.E. Principal Cluster Values of Continuous Functions.. Mathematische Zeitschrift, Tome 93 (1966) pp. 186-197. http://gdmltest.u-ga.fr/item/GDZPPN002397005/