On the Catholic Faith of the Greek Fathers (Contra Errores Graecorum)
This book is in Portuguese.
Aquinas's defence of the Catholic faith against the Greek positions on the Trinity, the procession of the Holy Spirit, the primacy of the Pope, and other contested doctrines — written for Urban IV in connection with reunion attempts.
Contents
Source: Latin text from the Leonine / Marietti editions (public domain), mirrored from aquinas.cc.