(1) Study: Infrasound Tornillos Produced by Volcán Cotopaxi’s Deep Crater. J. B. Johnson, M. C. Ruiz, H. D. Ortiz, L. M. Watson, G. Viracucha, P. Ramon, M. Almeida. First published: 13 June 2018.
https://agupubs.onlinelibrary.wiley.com/doi/10.1029/2018GL077766