Fernández Planas, Ana María, Eugenio Martínez Celdrán, Josefina Carrera Sabaté, Carlos Van Oosterzee, Valeria Salcioli Guidi, Joan Castellví Vives, and Dorota Szmidt Sierykow. 2004. “Interrogatives Absolutes Al Barceloní I Al Tarragoní (estudi Contrastiu)”. Journal of Experimental Phonetics 13 (December):129-55. https://revistes.ub.edu/index.php/experimentalphonetics/article/view/44366.