@article {layton2003semi,
	title = {A semi-Lagrangian double Fourier method for the shallow water equations on the sphere},
	journal = {Journal of Computational Physics},
	volume = {189},
	year = {2003},
	pages = {180{\textendash}196},
	publisher = {Elsevier},
	author = {Layton, Anita T and Spotz, William F}
}