1. Classical Normal Modes in Damped Linear Dynamic Systems
2. Co-Ordinates Which Uncouple the Equations of Motion of Damped Linear Dynamic Systems
3. and , Elementary Matrices, Cambridge University Press, London, 1957.
4. and , Dynamics of Structures, Prentice-Hall, Clifton, New Jersey, 1964, pp. 313–337.
5. and , ‘Dynamic soil-structure interaction’, Civil Engineering Studies, SRS No. 484, University of Illinois, Urbana, Ill., 1980, pp. 14–33.