@article {Shiga2013,
	title = {Boundary based on exchange symmetry theory for multilevel simulations. I. Basic theory},
	journal = {Journal of Chemical Physics},
	volume = {139},
	number = {4},
	year = {2013},
	month = {jul},
	pages = {044120},
	doi = {10.1063/1.4816629},
	author = {Shiga, Motoyuki and Masia, Marco}
}
