质监站完成两项北京市交通行业科技项目中期检...
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[???]- ^ "Geographic clustering and productivity: An instrumental variable approach for classical composers""Journal of Urban Economics", 2013, 73: 94-110 ???? ?????? 08 ????? 2017 ??? ???? ??? ??? ????.
- ^ Field? Alexander (2004). "Technological Change and Economic Growth the Interwar Years and the 1990s" (PDF). ????? ?? ????? (PDF) ?? 2025-08-05.
- ^ Sumanth, David J. Total Productivity Management (TPmgt): A Systemic and Quantitative Approach to Compete in Quality, Price and Time (???????????). CRC Press. p. 5. ISBN:9781574440577. Archived from the original on 2025-08-05. Retrieved 2025-08-05.