Luca Bortolussi, Andrea Sgarro, Giuseppe Longobardi, Cristina Guardiano. How many possible languages are there?. In Gemma Bel Enguix, Verónica Dahl, Maria Dolores Jiménez-López, editors, Biology, Computation and Linguistics - New Interdisciplinary Paradigms. Volume 228 of Frontiers in Artificial Intelligence and Applications, pages 168-179, IOS Press, 2011. [doi]
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