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... TV and related methods are applied in [39] to the reconstruction problem in ET with promising results. Higher order regularizers have also been applied to ET. A recent method introduced by Xu et al. =-=[49]-=- [24] reconstructs f by solving (1.4) with S(f) := λ ∫ u ( σ(f)(x), κ(f)(x) )∣∣∇f(x)∣∣dx, and D ( H(f), g ) := ∑ i ∫ ( hif(x)− gi )2 dx 9 where σ(f)(x) and κ(f)(x) are the mean and Gaussian curvatures...