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We consider the hadronic B decays B0bar -> D0 eta, B0bar -> D*0 eta, B0bar ->D0 eta', B0bar -> D*0 eta' in the framework of a quark-flavour basis andfactorization. The formalism allows to compute the decays to the eta meson andto relate them to those of the eta'. Measuring the branching ratios of theseprocesses may shed light on the nature of the eta-eta' mixing. On theexperimental side, only upper limits on the branching ratios are known atpresent.Comment: 12 pages, 2 figures, 2 tables (LaTeX, revtex), minor revision: note  added at the end concerning new data and few reference

$\bar{B}^0$ decays to $D^{(*)0} \eta$ and $D^{(*)0}\eta^\prime$

$\bar{B}^0$ decays to $D^{()0} \eta$ and $D^{()0}\eta^\prime$