@article {LimkumnerdS07,
	title = {Stress-free states of continuum dislocation fields: Rotations, grain boundaries, and the {N}ye dislocation density tensor},
	journal = {Physical Review B},
	volume = {75},
	year = {2007},
	pages = {224121},
	author = {Limkumnerd, S. and Sethna, J. P.}
}
