@article{MZ_1969__111_171197,
     author = {Karl Klee and Peter Sz\"usz},
     title = {On {Summability} of {Subsequences.}},
     journal = {Mathematische Zeitschrift},
     pages = {205--213},
     year = {1969},
     volume = {111},
     zbl = {0176.34301},
     url = {http://geodesic.mathdoc.fr/item/MZ_1969__111_171197/}
}