Almost all simulations have been done on hypercubic, subdivided lattices with -topology, which may introduce a systematic bias in the results. There is evidence that the choice of measure plays a role in the appearance and suppression of singular geometries, so-called spikes. The study of irregular lattices suggests a direct link of the transition points with the appearance of such spikes. This feature is reminiscent of the appearance of singular structures in dynamical triangulations. The coupling of a single scalar or -gauge field seems to have little influence on the phase structure of the gravitational sector.
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