@article{Tan-2014-PRB,
	doi = {10.1103/PhysRevB.89.235404},
	year = {2014},
	volume = {89},
	pages = {235404},
	author = {Ping-Heng Tan and Jiang-Bin Wu and Wen-Peng Han and Wei-Jie Zhao and Xin Zhang and Hui Wang and Yu-Fang Wang},
	title = {Ultralow-frequency shear modes of 2-4 layer graphene observed in scroll structures at edges},
	journal = {Phys. Rev. B}
}