@conference { J.Hesser1991,
	title = {On Steiner Trees and Genetic Algorithms},
	booktitle = {Parallelism, Learning, Evolution, Lect. Notes in Comp. Sci.},
	volume = {565},
	year = {1991},
	pages = {509-525},
	author = {Hesser , J. and Stucky , O. and M{\"a}nner , R.}
}
