《宋书·志·卷十七》
当时去塞宣太后神主已入拊童左后庙，长兼仪曹郎虞蛊发表意见认为： 按《春秋》义理，庶母即使名义上同样封有尊号，而实际上仍然与正嫡有别。
时太宗宣太后已祔章太后庙，长兼仪曹郎虞龢议以为： 《春秋》之义，庶母虽名同崇号，而实异正嫡。
At that time, the memorial tablet of Empress Dowager Xuan of Qu had been placed in the left temple after the young emperor. Yu Gu, who was also a member of the Ritual Department, expressed his opinion that according to the principles of "Spring and Autumn", even if the concubine has the same title in name, she is still different from the嫡.