Official PPI data based on the current reference base are not available on previous index reference base periods.
基于当前参考基准的官方生产者物价指数数据在以前的指数参考基准期是不可用的。
This citation index system covers the citation data on western journals in a broad range of academic disciplines. It provides search on source document and the cited reference.
本引文索引系统收录多个学科领域的西文期刊引文资料，提供来源文献检索和引文检索功能。
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