Ryckeboer, H. (1998). 'Substituting doen in tag questions and short replies in southern Dutch dialects'. In: I. Tieken-Boon van Ostade, M. van der Wal & A. van Leuvensteijn (eds.), DO in English, Dutch and German, History and present-day variation. Münster: Nodus Publikationen. 65-81.

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