@article {6106,
	title = {Critical theories of phase transition between symmetry protected topological states and their relation to the gapless boundary theories},
	journal = {Nuclear Physics B},
	year = {2013},
	pages = {248-259},
	doi = {10.1016/j.nuclphysb.2013.04.015},
	author = {Xie Chen and Fa Wang and Yuan-Ming Lu and Dung-Hai Lee}
}
