《资治通鉴·唐纪·唐纪五十一》
德宗又选择可以替代郑儋的人选，由于刑部员外郎严绶曾经以军府僚属的身份进献贡物，德宗记得他的名字，于是便起用他担任行军司马。
上择可以代儋者，以刑部员外郎严绶尝以幕僚进奉，记其名，即用为河东行军司马。
Emperor Dezong chose a candidate who could replace Zheng Dan. Since Yan Shou, the Yuanwailang of the Ministry of Justice, had once presented tribute as a subordinate staff of the military government, Emperor Dezong remembered his name, so he hired him as the Xingjun Sima.