Fournier, Rachel; Gussenhoven, Carlos; Peters, Jörg; Swerts, Marc; Verhoeven, Jo. "The tones of Limburg". Archived from the original on 26 February 2012. Retrieved 26 February 2012.
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Fournier, Rachel; Gussenhoven, Carlos; Peters, Jörg; Swerts, Marc; Verhoeven, Jo. "The tones of Limburg". Archived from the original on 26 February 2012. Retrieved 26 February 2012.