Míriam Luján, Carlos D. Martínez, Vicente Alabau, Evaluation of several Maximum Likelihood Linear Regression variants for language adaptation, Proceedings of the sixth international conference on Language Resources and Evaluation, LREC 2008, http://www.lrec-conf.org/proceedings/lrec2008/pdf/217_paper.pdf, ”the total number of people who speak Catalan is 7,200,000, (...). The Valencian language is spoken by 27% of all Catalan speakers.” citing Vilajoana, Jordi, and Damià Pons. 2001. Catalan, Language of Europe. Generalitat de Catalunya, Department de Cultura. Govern de les Illes Balears, Conselleria d’Educació i Cultura.