@book{12530,
	author = {Burkard, Reiner E. and Others and Ulrich, Derigs ; jt. auth.},
	title = {Assignment and matching problems; solution methods with FORTRAN-programs},
	publisher = {Springer-Verlag},
	year = {1980},
	series = {Lecture notes in Economics and Mathematical systems  ; 184},
	address = {Berlin}
}