当比特币失去其地位：COVID-19大流行前后加密货币的不确定性与加密货币间的动态溢出效应

When bitcoin lost its position: Cryptocurrency uncertainty and the dynamic spillover among cryptocurrencies before and during the COVID-19 pandemic

• Mohammad Al‐Shboul 通讯
• Ata Assaf
• Khaled Mokni