1. Constantinides, A.G., and Lawson, S.S.: ‘The design and analysis of wave digital filters that imitate the behaviour of lossless transmissionline filters’, Probléms de sensibilité en synthese des circuits, (Colloque tenu á Bruxelles 1974), p. 79–96
2. Lawson, S.S.: ‘Digital filter structures from classical analogue networks’, 1975, Ph.D. thesis, University of London