《北史·列传·卷二十九》
杨侃奏报，允许人们与官府一起铸造五铢钱，让人乐意去干，私铸钱币的流俗积弊就会改变。
侃奏听人与官并铸五铢，使人乐为，而俗弊得改。
Yang Kan put forward a memorial to the throne, allowing people to cast five-zhu coins together with the government. People would be willing to cast coins, and the longstanding evil practice of private casting coins would change.