1. Dynamics of Structures;Clough,1975
2. A response spectrum approach for random vibrations;Der,1980
3. Classical normal modes in damped linear dynamic systems;Caughey;J. Appl. Mech., ASME,1985
4. Seismic response by SRSS for proportional damping;Singh;J. Engng Mech. Div., ASCE,1980
5. Seismic response of light attachments to buildings;Villaverde,1980