@article {15209,
	title = {The lattice structure of flow in planar graphs},
	journal = {SIAM Journal on Discrete Mathematics},
	volume = {6},
	year = {1993},
	month = {1993///},
	pages = {477 - 477},
	author = {Khuller, Samir and Naor,J. S and Klein,P.}
}
