@conference {398,
	title = {Overview of BioASQ 2021: The Ninth BioASQ Challenge on Large-Scale Biomedical Semantic Indexing and Question Answering},
	booktitle = {International Conference of the Cross-Language Evaluation Forum for European Languages (CLEF2021) },
	year = {2021},
	publisher = {Springer},
	organization = {Springer},
	url = {https://link.springer.com/chapter/10.1007\%2F978-3-030-85251-1_18},
	author = {Nentidis, Anastasios and Katsimpras, Georgios and Vandorou, Eirini and Krithara, Anastasia and Gasco, Luis and Krallinger, Martin and Paliouras, Georgios}
}
