Update README.md

zbMATHOpen · Jul 2, 2021 · b47c84b · b47c84b
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 * [M. Petrera, I. Beckenbach, D. Ehsani, F. Müller, O. Teschke, B. Gipp, and M. Schubotz, zbMATH Open: API Solutions and Research Challenges. ArXiv, abs/2106.04664 (2021)](https://arxiv.org/abs/2106.04664)
 
-* [M. Schubotz, P. Scharpf, O. Teschke, A. Kühnemund, C. Breitinger, B. Gipp, AutoMSC: Automatic Assignment of Mathematics Subject Classification Labels, Intelligent Computer Mathematics - 13thInternational Conference, CICM 2020, Bertinoro, Italy, July 26-31, 2020, Proceedings](https://arxiv.org/pdf/2005.12099.pdf)
+* [M. Schubotz, P. Scharpf, O. Teschke, A. Kühnemund, C. Breitinger, B. Gipp, AutoMSC: Automatic Assignment of Mathematics Subject Classification Labels, Intelligent Computer Mathematics - 13thInternational Conference, CICM 2020, Bertinoro, Italy, July 26-31, 2020, Proceedings](https://arxiv.org/pdf/2005.12099.pdf) [DOI](https://doi.org/10.1007/978-3-030-53518-6_15)