1. Assessing first language vulnerability to attrition;Altenberg,1991
2. Overhearing a language during childhood;Au;Psychol. Sci.,2002
3. Clitic placement in European Portuguese and the position of subjects;Barbosa,1996
4. Spanish as a Heritage Language in the United States: State of the Field,2012
5. Heritage languages and their speakers: opportunities and challenges for linguistics;Benmamoun;Theor. Linguist.,2013