%0 Journal Article %A C. C. Lim %T Phase Transition to Quadrupolar Vortices in a Spherical Model of the Energy-Enstrophy Theory — Exact Solution %J Russian journal of nonlinear dynamics %D 2020 %P 543-555 %V 16 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/ND_2020_16_4_a1/ %G ru %F ND_2020_16_4_a1