. "A characterization of the average number of times a visit happens over a period of time."^^ . . . . "A characterization of the average number of times a visit happens over a period of time."@en . "Frequency" . "Frequency"^^ . . "Extra-Thematic"^^ . "Extra-Thematic" . . "2007-05-21T11:48:05+02:00"^^ . "A characterization of the average number of times a visit happens over a period of time."@en . "Frequency" . "RLG" . "fre" . "11787"^^ . .