2008. The variable expression of future tense in Peninsular Spanish: The present (and future) of inflectional forms in the Spanish spoken in a bilingual region. Language Variation and Change 20:1 ► pp. 85 ff.
Arroyo, José Luis Blas
2015. The scope of language contact as a constraint factor in language change: The periphrasishaber deplus infinitive in a corpus of language immediacy in modern Spanish. International Journal of Bilingualism 19:5 ► pp. 499 ff.
Blas Arroyo, José Luis & Javier Vellón Lahoz
2015. The refuge of a dying variant within the grammar: Patterns of change and continuity in the Spanish verbal periphrasishaber de + infinitive over the past two centuries. Language Variation and Change 27:1 ► pp. 89 ff.
2013. The Cambridge History of the Romance Languages,
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