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Bilingual speech corpus in two phonetically similar languages.. Proc. of LREC'06, 2006. pp. 1624-1627.As Speech Recognition Systems improve, they become suitable for facing new problems. Multilingual speech recognition is one such problems. In the present work, the case of the CV multilingual environment is studied. The official languages in the CV (Spanish and Valencian) share most of their acoustic units, and their vocabularies and syntax are quite similar. They have influenced each other for many years. A small corpus on an Information System task was developed for experimentation purposes. This choice will make it possible to develop a working prototype in the future, and it is simple enough to build semi-automatic language models. The design of the acoustic corpus is discussed, showing that all combinations of accents have been studied (native, non-native speakers, male, female, etc.).