Readme file add : citing Ohmpi

README.md

@@ -20,4 +20,12 @@ We strongly recommend users to create a virtual environment to run the code and
 `pip install RPi.GPIO adafruit-blinka numpy adafruit-circuitpython-ads1x15 pandas`
 *  check that requirements are met using `pip list`
 *  you should run you code within the virtual environment
-*  to leave the virtual environment simply type: `deactivate`
+*  to leave the virtual environment simply type: `deactivate`
\ No newline at end of file
+
+## Citing Ohmpi
+
+If you use Ohmpi for you work, please cite [this paper](https://www.sciencedirect.com/science/article/pii/S2468067220300316) as:
+
+    Rémi Clement, Yannick Fargier, Vivien Dubois, Julien Gance, Emile Gros, Nicolas Forquet, OhmPi: An open source data logger for 
+    dedicated applications of electrical resistivity imaging at the small and laboratory scale, HardwareX, Volume 8, 2020, e00122, ISSN 2468-0672, https://doi.org/10.1016/j.ohx.2020.e00122..
+