@article {10158,
	title = {Local wave grouping in a parameter-gradient system and its formation mechanism},
	journal = {Physical Review E - Statistical, Nonlinear, and Soft Matter Physics},
	year = {2008},
	doi = {10.1103/PhysRevE.77.016206},
	author = {Huimin Liao and Yangle Wu and Jianglei Yu and Qi Ouyang}
}
