https://www.executivegov.com/articles/dhs-seeks-proposals-on-technologies-that-can-perform-crowd-count-and-analysis
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https://scholar.hit.edu.cn/en/publications/direct-measure-matching-for-crowd-counting/
Direct Measure Matching for Crowd Counting - Harbin Institute of Technology
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https://countingcrowds.org/
Counting Crowds – Blog of the Crowd Counting Consortium
Blog of the Crowd Counting Consortium
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