https://dds.las.ac.cn/service/book?appId=a1vacbnPuv9qJRzJvdNXfsesj9JbIa6e&appKey=sPBA4vANLzjnW1k5eufEcc4k7dxfNraW&ts=1730417744874&signature=771940c89cacf1d02bc81bca051b9cd2&name=The+propositional+logic+of+boethius&author=Durr%2C+Karl.&publishYear=1951&isn=&publisher=Amsterdam+%3A+North-Holland+pub.+co.%2C+1951.&destLibCode=311001&destLibName=中国科学院文献情报中心&agentLibCode=311001&agentLibName=中国科学院文献情报中心