Update README.md

README.md

@@ -55,6 +55,8 @@ Check the [GHER publications](http://modb.oce.ulg.ac.be/mediawiki/index.php/Publ
 
 #### Theory
 
+Barth, A., Beckers, J.-M., Troupin, C., Alvera-Azcárate, A., and Vandenbulcke, L.: divand-1.0: n-dimensional variational data analysis for ocean observations, Geosci. Model Dev., 7, 225-241, [doi:10.5194/gmd-7-225-2014](http://dx.doi.org/10.5194/gmd-7-225-2014), 2014.
+
 Troupin, C.; Sirjacobs, D.; Rixen, M.; Brasseur, P.; Brankart, J.-M.; Barth, A.; Alvera-Azcárate, A.; Capet, A.; Ouberdous, M.; Lenartz, F.; Toussaint, M.-E. & Beckers, J.-M. (2012) Generation of analysis and consistent error fields using the Data Interpolating Variational Analysis (Diva). *Ocean Modelling*, **52-53**: 90-101. doi:[10.1016/j.ocemod.2012.05.002](http://dx.doi.org/10.1016/j.ocemod.2012.05.002)
 
 Beckers, J.-M.; Barth, A.; Troupin, C. & Alvera-Azcárate, A. Some approximate and efficient methods to assess error fields in spatial gridding with DIVA (Data Interpolating Variational Analysis) (2014). *Journal of Atmospheric and Oceanic Technology*,  **31**: 515-530. doi:[10.1175/JTECH-D-13-00130.1](http://dx.doi.org/10.1175/JTECH-D-13-00130.1)