1. Sebastiani F. Machine learning in automated text categorization. ACM Comput Surveys (CSUR). 2002; 34:1–47.
2. Jimeno-Yepes A, Wilkowski B, Mork JG, Lenten EV, Fushman DD, Aronson AR. A bottom-up approach to MEDLINE indexing recommendations. In: Proceedings of the AMIA Annual Symposium: 2011. p. 1583–92.
3. Scott S, Matwin S. Feature engineering for text classification. In: ICML, Volume 99. Citeseer: 1999. p. 379–88.
4. Bodenreider O. The unified medical language system (UMLS): integrating biomedical terminology. Nucleic Acids Res. 2004; 32(suppl 1):D267–70.
5. Bodenreider O, Nelson SJ, Hole WT, Chang HF. Beyond synonymy: exploiting the UMLS semantics in mapping vocabularies. In: Proceedings of the AMIA symposium. American Medical Informatics Association: 1998. p. 815.