Decaying quasi-2D turbulence in a stratified fluid with circular boundaries S. R. Maassen, H. J. H. Clercx and G. J. F. van Heijst Europhys. Lett., 46 3 (1999) 339-345 Published online: 01 September 2002 DOI: 10.1209/epl/i1999-00266-0