1. Lewis, E.O., and Currie, B.W.: Arctic ship trials of a dual-polarized ice navigation radar, London 1987), p. 404–408 Radar-87 Int. Conf.,IEE Conf. Publ. 281
2. Lewis, E.O., Currie, B.W., and Haykin, S.: Detection and classification of ice, (Research Studies Press 1987)