https://dds.las.ac.cn/service/document?appId=a1vacbnPuv9qJRzJvdNXfsesj9JbIa6e&appKey=sPBA4vANLzjnW1k5eufEcc4k7dxfNraW&ts=1763029737865&signature=d5a6485ce8df7e725410242bdbd9b897&articleTitle=Ten+Mathematical+Essays+on+Approximation+in+Analysis+and+Topology&articleAuthor=J.+Ferrera+%2F+J.+Lopez-Gomez+%2F+F.R.+Ruiz+del+Portal&publicationTitle=Ten+Mathematical+Essays+on+Approximation+in+Analysis+and+Topology&language=&publicationType=1&publishYear=&isn=9780444518613&publisher=