@article {Ong:September 1997:0924-0136:29,
	author = "Ong S.K.",
	author = "De Vin L.J.",
	author = "Nee A.Y.C.",
	author = "Kals H.J.J.",
	title = "Fuzzy set theory applied to bend sequencing for sheet metal bending",
	journal = "Journal of Materials Processing Technology",
	volume = "69",
	year = "September 1997",
	abstract = "",
	pages = "29-36(8)",
	url = "http://www.ingentaconnect.com/content/els/09240136/1997/00000069/00000001/art00035"
	doi = "doi:10.1016/S0924-0136(96)00035-0"
}