1. Hawkins, F. J., "An Automatic Resonance Testing Technique for Exciting Normal Modes of Vibration of ComplexStructures", Symposium IUTAM, "Progres Recents de la Mecanique des Vibrations Lineaires", 1965, pp. 37-41.
2. Hawkins, F. J., "GRAMPA -An Automatic Technique for Exciting the Principal Modes of Vibration of ComplexStructures", Royal Aircraft Establishment, RAE-TR-67-211, 1967.
3. Taylor, G. A., Gaukroger, D. R., Skingle, C. W., "MAMA - A Semi-Automatic Technique for Exciting the Principal Modes of Vibration of Complex Structures", Aeronautical Research Council, ARC-R/M-3590, 1967, 20 pp.
4. Allemang, R.J., Phillips, A.W., "The Unified Matrix Polynomial Approach to Understanding Modal ParameterEstimation: An Update", Proceedings, International Conference on Noise and Vibration Engineering (ISMA), 2004.
5. Allemang, R.J., Brown, D.L., "A Unified Matrix Polynomial Approach to Modal Identification", Journal of Sound and Vibration Vol. 211, No. 3, pp. 301-322, April 1998.