《北史·列传·卷七十七》
崖州曾经进献直径一寸的珠，送宝的人私下更换，皇帝心中有疑，就召杨伯丑让他算卦。
崖州尝献径寸珠，其使者阴易之，上心疑焉，召伯丑令筮。
Yaizhou once presented a pearl that was an inch in diameter; the person who delivered the treasure secretly replaced it, the emperor had doubts in his heart, and he summoned Yang Bofu and asked him to read the divination.