John W. Ruge, Yong Li, Steve F. McCormick, Achi Brandt, J. R. Bates. A Nonlinear Multigrid Solver for a Semi-Lagrangian Potential Vorticity-Based Shallow-Water Model on the Sphere. SIAM J. Scientific Computing, 21(6):2381-2395, 2000. [doi]
Abstract is missing.