www.orbitax.com/taxhub/?newsDate=29-08-2017
www.tmf-group.com/es-co/news-insights/articles/2017/october/ecuador-tax-haven-regulation/
www.pbplaw.com/se-modifica-la-lista-de-paraisos-fiscales-y-regimenes-fiscales-preferentes/
www.pudeleco.com/clegal/tributario/2017/it170817.pdf
ohmecuador.com/circular-78-suplemento-r-o-no-59-17-de-agosto-de-2017/
Update:
www.ey.com/en_gl/tax-alerts/ecuadorian-tax-authority-reforms-definitions-and-tax-treatment-f