Fernández Planas, A. M., E. Martínez Celdrán, J. Carrera Sabaté, C. Van Oosterzee, V. Salcioli Guidi, J. . Castellví Vives, and D. Szmidt Sierykow. “Interrogatives Absolutes Al Barceloní I Al Tarragoní (estudi Contrastiu)”. Journal of Experimental Phonetics, vol. 13, Dec. 2004, pp. 129-55, https://revistes.ub.edu/index.php/experimentalphonetics/article/view/44366.