Spontaneous Speech Corpora for language learners of Spanish, Chinese and Japanese. - Antonio Moreno-Sandoval; Leonardo Campillos-Llanos; Yang Dong; Emi Takamori; José María Guirao; Khaled Shaalan; Paula Gozalo; Chieko Kimura; Kengo Matsui; Marta Garrote Salazar (LREC, 2012)