Abstract
In this paper Hubbell's rectangular source integral H′( a, b), which is a double integral, is expressed as a series of many converging single integrals I n ( a, b). Recurrence relations relate these integrals. Once one integral I 1 is computed, recurrence relations are used to compute other integrals. I 1( a, b) can be computed analytically. H′( a, b) is approximated by considering the first seven terms in the series and the results are found to give good results for various values of a and b. Results are presented for the values of a and b (0.1 to 20 and to 2), respectively. The rate of convergence depends on the values of a and b.
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