01Exponential backoff retry logic for API rate limits and server errors
02Smart input parsing for DOIs, arXiv IDs, PMIDs, or bibliographic search
03Supports multiple citation formats: CSL-JSON, BibTeX, RIS, and formatted text (APA, Chicago, IEEE)
04Built-in caching (memory or JSON file) with configurable TTL
05Polite Pool support using mailto parameter for higher Crossref rate limits
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