1. Golomb, S.W.: ‘Shift register sequences’, (Holden-Day San Francisco 1967)
2. Krekó, Béla: ‘Linear programming’, (Sir Isaac Pitman & Sons Ltd. 1968),translated by J.H.L. Ahrens and C.M. Safe
3. Burkard, R.E.: ‘Locations with spatial interactions: the quadratic assignment problem’, Mirchandani, P.B., Francis, R.L., Discrete location theory, (John Wiley 1991)