@book{16137,
	author = {NATO Advaced Research Institute, Banff, Alberta, August 1977 and Hammer, P. L.},
	title = {Discrete optimization and systems application of the systems science panel of NATO and of the discrete optimization symposium co-sponsored by IBM Canada and SIAM; proceedings},
	publisher = {North-Holland,},
	year = {1979},
	series = {Annals of Discrete Mathematics },
	address = {Amsterdam:}
}