https://dds.las.ac.cn/service/document?appId=a1vacbnPuv9qJRzJvdNXfsesj9JbIa6e&appKey=sPBA4vANLzjnW1k5eufEcc4k7dxfNraW&ts=1763018284084&signature=338dadfe2577b790f098aac885d5d074&articleTitle=Complexity+Theory+Retrospective&articleAuthor=Alan+L.+Selman&publicationTitle=Complexity+Theory+Retrospective&language=&publicationType=1&publishYear=1990&isn=9780387973500&publisher=Springer+New+York