Vanishing viscosity limits and long-time behavior for 2D quasi-geostrophic equations Luigi Berselli 35Q3035B4035B4176B03quasi-geostrophic and Euler equationsvanishing viscosityattractors Indiana University Mathematics Journal 2002 text pdf 10.1512/iumj.2002.51.2075 10.1512/iumj.2002.51.2075 en Indiana Univ. Math. J. 51 (2002) 905 - 930 state-of-the-art mathematics http://iumj.org/access/