Gramàtica zero
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- Author: Esteve Francesc Melià Josepa
- Language: Catalan
- Year: 2011
- Author: Dorandeu J. Prudon M.
- Language: Catalan
- Year: 2009
- Author: Pompeu Fabra
- Language: Catalan
- Year: 2006
- Author: Badia Joan Brugarolas Camps Núria Grifoll Jordi
- Language: Catalan
- Year: 2008
- Author: Badia Joan Brugarolas Camps Núria Grifoll Jordi
- Language: Catalan
- Year: 2012
- Author: Montserrat Costa Maria Lluïsa Sabater
- Language: Catalan
- Year: 1996
- Author: Eric Freysselinard
- Language: French
- Year: 2005
- Author: Dorandeu Joan Montserrat Moral de Prudon
- Language: Catalan
- Year: 2007