Rinken, S., Domínguez-Álvarez, J.-A., Trujillo, M., Lafuente, R., Sotomayor, R., & Serrano-del-Rosal, R. (2020). Combined mobile-phone and social-media sampling for web survey on social effects of COVID-19 in Spain. Survey Research Methods, 14(2), 165-170. https://doi.org/10.18148/srm/2020.v14i2.7733