A method previously described by Butterworth and Ipser for constructing models of rapidly rotating fluid bodies in general relativity is modified to enable construction of solutions whose sources are very highly flattened. In particular, solutions with increasing oblateness and decreasing angular velocity are exhibited. Also, a discussion is given of the possible association of the termination of relativistic sequences by equatorial shedding and the first secular axisymmetric instability of the Maclaurin spheroids.
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E. M. Butterworth (1979) studied this question.