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Hellwig and Wirth (2008a, October 24). Panel-based mobile online research. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/panel-based-mobile-online-research
Markut and Hellwig (2007a, October 28). Web 2.0 market research. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/web-2-0-market-research
Hellwig and Vosskötter (2005a, April 17). New ways of panel recruiting. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/new-ways-of-panel-recruiting