《资治通鉴·隋纪·隋纪二》
隋文帝因为独孤陀是皇后的同父异母弟，独孤陀的妻子是杨素的同父异母妹，因此怀疑是独孤陀所为，下令高等人一起审理验证，全部弄清了事实真相。
上以陀，后之异母弟，陀妻，杨素异母妹，由是意陀所为。令高颎等杂治之，具得其实。
 Since Du Gu Tuo was the Empress’s half brother, and Du Gu Tuo’s wife was Yang Su’s half sister, Emperor Wen was suspicious of them.  He ordered high-ranking officials to jointly examine and verify the truth, and eventually the whole story came to light.