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"Sloshing Effects"

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Can someone guide me to any reference materials pertaining to seismic
effects of liquids in storage tanks?  UBC '97 makes mention of, "inertial
effects of the contained fluid."  IBC 2000 (which is the code in effect for
my project) makes mention of, "sloshing period of the stored liquid," and
states that, "The tank shall be designed to resist the effects of sloshing."
Furthermore, AWWA D100-96 states, "The design of ground-supported
flat-bottom tanks recognizes the reduction in seismic load due to the
sloshing of the contained liquid.  This design procedure is referred to as
the effective mass method."  There are some references in the Appendix, but
nothing more recent than 1984.  

Thanks in advance for any help you can provide.

Frank Griffin
Ft. Worth, Texas