update README, add refs

Author: demanast@triangle

README.md

@@ -344,6 +344,8 @@ This project has received funding from the European Union’s Horizon 2020 resea
 Disclaimer: the content of this website reflects only the author’s view and the Commission is not responsible for any use that may be made of the information it contains.
 
 ## References
+* Anastasiou D., Ganas A., Legrand J., Bruyninx C., Papanikolaou X., Tsironi V. and Kapetanidis V. (2019). Tectonic strain distribution over Europe from EPN data. EGU General Assembly 2019, Geophysical Research Abstracts, Vol. 21, EGU2019-17744-1 [Abstract](https://meetingorganizer.copernicus.org/EGU2019/EGU2019-17744-1.pdf)
+
 * Shen, Z.-K., M. Wang, Y. Zeng, and F. Wang, (2015), Strain determination using spatially discrete geodetic data, Bull. Seismol. Soc. Am., 105(4), 2117-2127, doi: 10.1785/0120140247
 
 * Veis, G., Billiris, H., Nakos, B., and Paradissis, D. (1992), Tectonic strain in greece from geodetic measurements, C.R.Acad.Sci.Athens, 67:129--166