https://dds.las.ac.cn/service/document?appId=a1vacbnPuv9qJRzJvdNXfsesj9JbIa6e&appKey=sPBA4vANLzjnW1k5eufEcc4k7dxfNraW&ts=1763029828593&signature=c629921bd873f23ceb33531939d5e7f0&articleTitle=Non-Solar+X-+and+Gamma-Ray+Astronomy&articleAuthor=L.+Gratton&publicationTitle=Non-Solar+X-+and+Gamma-Ray+Astronomy&language=&publicationType=1&publishYear=1970&isn=9789401033138&publisher=Springer+Netherlands