@article{MaZi93,
	author = {Rudolf Mathar and Antanas Zilinskas},
	title = "On global optimization in two-dimensional scaling",
	pages = "109-118",
	journal = "Acta Aplicandae Mathematicae",
	volume = "33",
	year = 1993,
	hsb = {RWTH-CONV-223130},
	}