1. and , Dynamics of Structures, McGraw-Hill, New York, 1975, pp. 239–241 and 557–562.
2. ‘Modal coupling and earthquake response of tall buildings’, Report No. EERL 71–07, Earthquake Engineering Research Laboratory, California Institute of Technology, Pasadena, California, 1971.
3. and , ‘Coupled lateral torsional response of buildings to ground shaking’, Report No. EERC 76–13, Earthquake Engineering Research Center, University of California, Berkeley, California, 1976.
4. and , Fundamentals of Earthquake Engineering, Prentice-Hall, Englewood Cliffs, N.J., 1971, pp. 308–310.