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Relatively new stuff:
2018 PNAS: separating multiple kinds of motion-related signals via multi-echo fMRI (added response to Spreng et al.)
2017 TICS: empirical and logical issues related to global fMRI signals
2017 PLOS ONE: temporal interpolation (despiking, slice time correction) makes motion artifact harder to detect
2017 Neuroimage: mapping causes and spatial distributions of global fMRI signals
2017 Neuroimage: why "the plot" is helpful for understanding an fMRI scan