... perturbations[*]
It may be shown that the configurations which realize the extrema of the $M_{\rm B}$ and M at fixed J coincide, see Harrison et al. (1965) for the static case, and Friedman et al. (1988) for uniformly rotating configurations.
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...1988)[*]
We note a misprint in this Lemma text as printed in Friedman et al. (1988), who use dots to denote a derivative with respect to $\lambda$: the dot over the right bracket in $(\dot \Omega \dot J + \dot \mu \dot N\dot{)}\ne 0$ is missing.
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Copyright ESO 2004