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H. S. Cohl, J. E. Tohline, A. R. P. Rau, & H. M. Srivastava (2000)
Developments in Determining the Gravitational Potential Using Toroidal Functions
Astronomische Nachrichten, Vol. 321, no. 5, pp. 363 - 372
and
Erratum (2012, Astr. Nach., 333, Issue 8, 784 - 785)