@article {10113,
	title = {Transition from spiral waves to defect-mediated turbulence induced by gradient effects in a reaction-diffusion system},
	journal = {Physical Review E - Statistical, Nonlinear, and Soft Matter Physics},
	year = {2003},
	pages = {362021-362027},
	author = {Chunxia Zhang and Hong Zhang and Qi Ouyang and Bambi Hu and Gemunu H. Gunaratne}
}
