Massey, J. T. (1988). An overview of telephone coverage. In R. M. Groves, P. P. Biemer, L. E.
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Massey, J. T. 1988: An Overview of Telephone Coverage. In: R. M. Groves, P.P. Biemer, L.E. Lyberg, J.T. Massey, W.L. Nicholls II, J. Waksberg (Hg.): Telephone Survey Methodology, New York: Wiley, S. 3-8.
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