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Moustaki, Irini ORCID: 0000-0001-8371-1251 and Marcoulides, George. A (2002) Locating "don't know", "no answer" and middle alternatives on an attitude scale: a latent variable approach. In: Marcoulides, G and Moustaki, Irini, (eds.) Latent Variable and Latent Structure Models. Lawrence Erlbaum Associates, U.S., pp. 15-41. ISBN 9780805840469