《新唐书·列传·卷一百四十六》
贞元时，与吐蕃相攻。吐蕃每年要西向抵抗大食，所以很少侵扰我边域。
贞元时，与吐蕃相攻，吐蕃岁西师，故鲜盗边。
During the Zhenyuan era, they fought with Tufan. Tufan had to resist Dasan from the west every year, so it seldom harassed our border areas.