模糊文档匹配/文本指纹识别的最佳库

I am thinking of building an API that would let a program submit a "fingerprint" of an academic publication, match this against a database of articles from Open Access journals, and if found, send the user the canonical citation information. Initially this would be for a specific small research field, so it wouldn't necessarily need to deal with 20 million papers to be successful (even if the 1000 most commonly cited papers in the field were covered, that would be a huge boon for productivity and collaboration).I am thinking of building an API that would let