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2. Analysis of machine foundation vibrations: state of the art;Gazetas;Soil Dyn Earthq Eng,1983
3. Impedance function of a group of vertical piles;Wolf,1978
4. Dynamic group effect of multiple piles under vertical vibration;Nogami,1979
5. Dynamic stiffness and seismic response of pile groups (Research Report R82-03);Kaynia,1982