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Lorenc, Boris, ed. et al. The unit problem and other current topics in business survey methodology. Newcastle upon Tyne: Cambridge Scholars Publishing, 2018. ix, 288 stran. ISBN 978-1-5275-1661-8.

Lorenc, B., Smith, P. A., Bavdaž, M., Haraldsen, G., Nedyalkova, D., Zhang, L., & Zimmermann, T. (2018). The unit problem and other current topics in business survey methodology. Newcastle upon Tyne: Cambridge Scholars Publishing.

Lorenc, Boris, Paul A. Smith, Mojca Bavdaž, Gustav Haraldsen, Desislava Nedyalkova, Li-Chun Zhang, and Thomas Zimmermann. The Unit Problem and Other Current Topics in Business Survey Methodology. Newcastle upon Tyne: Cambridge Scholars Publishing, 2018.

Lorenc, Boris, et al. The Unit Problem and Other Current Topics in Business Survey Methodology. Newcastle upon Tyne: Cambridge Scholars Publishing, 2018.