Stable and symmetric quasi-geostrophic barotropic flows over topography Fabio Cavallini, Fulvio Crisciani, Renzo Mosetti and Roberto Purini Eur. Phys. J. Plus, 129 9 (2014) 199 Published online: 25 September 2014 DOI: 10.1140/epjp/i2014-14199-6