Geodesic
Least squares approximations for dual trigonometric series
Glasgow mathematical journal, Tome 14 (1973) no. 2, pp. 111-119

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A systematic and easily automated least squares procedure, not using integral equations or special functions, is presented for approximating the solutions of general dual trigonometric equations. This is desirable, since current analytic methods apply only to special equations, require the use of integral equation and special function theory, and do not lend themselves easily to numerical work; see, e.g. [1, 2, 6, 8, 9,10, 11, 12, 13, 14, 15, 16, 17]. 
Kelman, Robert B.; Jr, Chester A. Koper. Least squares approximations for dual trigonometric series. Glasgow mathematical journal, Tome 14 (1973) no. 2, pp. 111-119. doi: 10.1017/S0017089500001841
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