  We analyze the prospects for detecting the three neutral Higgs bosons of the
Minimal Supersymmetric extension of the Standard Model in the intense-coupling
regime at e+e- colliders. Due to the small mass differences between the Higgs
states in this regime and their relative large total decay widths, the
discrimination between the particles is challenging at the LHC and in some
cases even impossible. We propose to use the missing mass technique in the
Higgs-strahlung process in e+e- collisions to distinguish between the two
CP-even Higgs eigenstates h and H, relying on their b b-bar decay in the
b,b-bar,l+,l- event sample. Ah and AH associated production is then studied in
the 4b-jet event sample to probe the CP-odd A boson. At collider energies
sqrt(s) = 300 GeV and an integrated luminosity of 500 fb-1, accuracies in the
mass measurement of the CP-even Higgs bosons are expected to range from 100 to
300 MeV, while for the CP-odd A boson, accuracies of less than 500 MeV can be
obtained.
