@article {balaban1997observation,
	title = {Observation of the logarithmic dispersion of high-frequency edge excitations},
	journal = {Physical Review B},
	volume = {55},
	year = {1997},
	pages = {R13397},
	publisher = {APS},
	author = {Balaban, NQ and Meirav, U and Shtrikman, Hadas and Umansky, V}
}
