H/A Higgs Mixing in CP-Noninvariant Supersymmetric Theories
  For large masses, the two heavy neutral Higgs bosons are nearly degenerate in many 2--Higgs doublet models, and particularly in supersymmetric models. In such a scenario the mixing between the states can be very large if the theory is CP-noninvariant. We analyze the formalism describing this configuration, and we point to some interesting experimental consequences. 
S.Y. Choi, J. Kalinowski, Y. Liao, P.M. Zerwas