《元史·列传·卷五十四》
元帅阿术同意，把黑杨都统扣留下来，第三天文焕果然开门投降。
元帅阿术然之，乃留不遣。又明日，文焕举城降。
The Marshal Ashu agreed and detained the General Commander Hei Yang, and on the third day, Tianhuan truly opened the city gate and surrendered.