@article {KivelsonRS88,
	title = {2e or not 2e - flux-quantization in the resonating valence bond state},
	journal = {Europhysics Letters},
	volume = {6},
	year = {1988},
	pages = {353-358},
	author = {Kivelson, S. A. and Rokhsar, D. S. and Sethna, J. P.}
}
