Eddington, David Ellingson. 2019. “Variation in interrogative adverbials: ’cuán’, ’qué tan’, ’cómo de’,’lo que’ and ’lo’+adj./adv.+’que’”.
Borealis – An International Journal of Hispanic Linguistics
8 (2):321-42. https://doi.org/10.7557/1.8.2.4909.