  The cross-section for the reaction $e^+e^- \rightarrow b\bar{b}\mu^+\mu^-$ is
calculated with a semi-analytical integration of the phase space. Compact
formulae are obtained for the total cross section and for invariant mass
distributions of the $\mu^+\mu^-$ and $b\bar{b}$ pairs. The background diagrams
to $ZH$ production yield analytically cumbersome but numerically small
contributions. The numerical results are compared with those from a Monte Carlo
approach.
