@article {JacobsenJS97,
	title = {Rate theory for correlated processes: Double jumps in adatom diffusion},
	journal = {Physical Review Letters},
	volume = {79},
	year = {1997},
	pages = {2843-2846},
	author = {Jacobsen, J. and Jacobsen, K. W. and Sethna, J. P.}
}
