skos:altLabel | - NL
- IRMA
- Top 100 Albums
- Schweizer Hitparade
- GFK
- Gesellschaft für Konsumforschung
- GfK Eurisko
- GfK NOP
- GfK Retail and Technology Italia
- GfK Roper Public Affairs
- GfK SE
- GfK Ukraine
- GfK#Central and Eastern Europe
- GfK-Telemeter
- Gfk
- Gfk Roper
- Gfk SE
- Knowledge Networks
- National Opinion Polls
- Roper Opinion Research
- Society for Consumer Research
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