The Oblateness of an Axisymmetric Rotating Fluid Avner FriedmanBruce Turkington Indiana University Mathematics Journal 1980 text pdf 10.1512/iumj.1980.29.29056 10.1512/iumj.1980.29.29056 en Indiana Univ. Math. J. 29 (1980) 777 - 792 state-of-the-art mathematics http://iumj.org/access/