%0 Journal Article %A PAPACHRISTODOULOS, CHRISTOS %T UPPER AND LOWER FREQUENTLY UNIVERSAL SERIES %J Glasgow mathematical journal %D 2013 %P 615-627 %V 55 %N 3 %U http://geodesic.mathdoc.fr/articles/10.1017/S001708951200078X/ %R 10.1017/S001708951200078X %F 10_1017_S001708951200078X