M. Abramowitz and I. A. Stegun, eds., <a href="http://appswww.nrbookconvertit.com/abramowitz_and_stegunGo/ConvertIt/Reference/indexAMS55.htmlASP">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972, Chapter 17, pp. 589-626.
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G. C. Greubel, <a href="/A163973/b163973.txt">Table of n, a(n) for n = 1..5000</a>
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M. Abramowitz and I. A. Stegun, eds., <a href="http://wwwapps.nrbook.com/abramowitz_and_stegun/index.html">Handbook of Mathematical Functions</a>, National Bureau of Standards, Applied Math. Series 55, Tenth Printing, 1972, Chapter 17, pp. 589-626.
Versnel found, with a little help from the author, expressions for Rs = C(d)*(V/I) for several Van der Pauw structures if d, the ratio of the sum of the lengths of the contacts and the length of the boundary of the sheet, tends to zero, see the formulae formulas (first two terms are given). For point contacts, i.e., d = 0, Van der Pauw's constant appears.
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Wikipedia.org, <a href="http://en.wikipedia.org/wiki/Van_der_Pauw_method">Van der Pauw method</a>
Wikipedia, <a href="http://en.wikipedia.org/wiki/Van_der_Pauw_method">Van der Pauw method</a>
(PARI) Pi/log(2) \\ Charles R Greathouse IV, Jan 30 2016
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