"Frequency" . . . "The number of times an event occurs per some unit of time."^^ . "2007-04-02T12:34:57+02:00"^^ . "11610"^^ . "MJE" . . . . "The number of times an event occurs per some unit of time."@en . . . . . "Frequency" . "Extra-Thematic" . "Extra-Thematic"^^ . "Frequency"^^ . . "The number of times an event occurs per some unit of time."@en . "fre" .