Extraction of Crossref datadump for benchmarking purpose

Extracted form a datadump provided here. The file contains several JSON files limiting to benchmark tools that have to process huge dataset in JSON format.本数据集提取自此处提供的数据转储（datadump）文件。该文件包含若干JSON格式文件，仅限用于需处理超大规模JSON格式数据集的基准测试工具。