* [Inside–outside–beginning (tagging) - Wikipedia](https://en.wikipedia.org/wiki/Inside%E2%80%93outside%E2%80%93beginning_%28tagging%29) * [nlp - Difference between IOB and IOB2 format? - Data Science Stack Exchange](https://datascience.stackexchange.com/questions/37824/difference-between-iob-and-iob2-format) * [KrishnanGanapathy-NamedEntityRecognition.pdf](http://cs229.stanford.edu/proj2005/KrishnanGanapathy-NamedEntityRecognition.pdf) * [NLP | IOB tags - GeeksforGeeks](https://www.geeksforgeeks.org/nlp-iob-tags/) * [Representing Text Chunks](https://www.aclweb.org/anthology/E99-1023.pdf)
