@inbook{Ma91,
	author = {Rudolf Mathar},
	title = "Dual algorithms in {M}ultidimensional {S}caling",
	pages = "99-103",
	volume = "33",
	publisher = "Springer Verlag",
	series = "Classification, Data Analysis, and Knowledge Organization",
	editor = "H.H. Bock, P. Ihm",
	address = "Berlin",
	year = 1991,
	hsb = {RWTH-CONV-223645},
	}