@book{9391,
	author = {Van Valkenburg, M.E.},
	title = {Network analysis.- 2nd ed. / M.E.Van Valkenburg},
	publisher = {Englewood Cliffs, N.J., Prentice-Hall [1964]},
	address = {Englewood Cliffs, N.J., Prentice-Hall [1964]},
	edition = {2nd ed.}
}