@article{10_1017_S001708951200078X,
     author = {PAPACHRISTODOULOS, CHRISTOS},
     title = {UPPER {AND} {LOWER} {FREQUENTLY} {UNIVERSAL} {SERIES}},
     journal = {Glasgow mathematical journal},
     pages = {615--627},
     year = {2013},
     volume = {55},
     number = {3},
     doi = {10.1017/S001708951200078X},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S001708951200078X/}
}