@article{MaMe93,
	author = {Rudolf Mathar and Renate Meyer},
	title = "Preorderings, monotone functions, and best rank r approximations with applications to classical {MDS}",
	pages = "291-305",
	journal = "Journal of Statistical Planning and Inference",
	volume = "37",
	year = 1993,
	hsb = {RWTH-CONV-223131},
	}