《辽史·本纪·卷二十二》
三月十五日，宋主赵曙崩殂，子赵顼即位，派使者前来告哀，当即派遣右护卫太保萧挞不也、翰林学士陈觉等前往吊唁祭祀。
三月癸亥，宋主曙殂，子顼嗣位，遣使告哀；即遣右护卫太保萧挞不也、翰林学士陈觉第吊祭。
On the fifteenth day of March, Song Emperor Zhao Shu died, his son Zhao Xu ascended the throne, and sent an envoy to mourn. The right guardian of the palace, Taibao Xiao Taba and the Imperial Academy scholar Chen Jue were immediately dispatched to attend the burial and sacrifices.