The homogeneous Green's function, i.e., the superposition of the causal Green's function and its time reversal, is traditionally represented by a closed boundary integral. This integral representation finds applications in holographic imaging, seismic interferometry and time-reversal acoustics. In principle these methods account for all multiples, but only when the medium is accessible from all sides. Here we discuss a single-sided representation of the homogeneous Green's function, which also accounts for all multiples, but which can be used when the medium is accessible from one side only. We indicate the application of this representation for seismic imaging, accounting for internal multiple scattering.


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