Fixing readme with information on the arxiv link.

README.md

 # Active Learning for Loading Case Selection
 
-Accessory repository for the paper "Accelerating engineering design by automatic selection of simulation cases through Pool-Based Active Learning" including notebooks and data necessary to reproduce all results of the paper. 
+Accessory repository for the paper "Accelerating engineering design by automatic selection of simulation cases through Pool-Based Active Learning" including notebooks and data necessary to reproduce all results of the paper: 
+
+- J.H.C. Gaspar Elsas, N.A.G. Casaprima, I.F.M. Menezes, Accelerating engineering design by automatic selection of simulation cases through Pool-Based Active Learning, [arXiv:2009.01420](https://arxiv.org/abs/2009.01420)
+
+### Citation
+
+    @misc{elsas2020accelerating,
+    title={Accelerating engineering design by automatic selection of simulation cases through Pool-Based Active Learning},
+    author={José Hugo C. Gaspar Elsas and Nicholas A. G. Casaprima and Ivan F. M. Menezes},
+    year={2020},
+    eprint={2009.01420},
+    archivePrefix={arXiv},
+    primaryClass={cs.CE}
+    }
 
 The files in this repository are Notebooks, containing the code used to produce the results, and data files which are processed by the notebooks.