1. G. Bogdanov, R. Ludwig, and W. Michalson, Measur. Sci. Technol. 11, 157 (2000).
2. J. G. Stander, J. Plunkett, D. Zenger, J. McNeill, and R. Ludwig, “Electric resistivity testing of green-state powdered metallurgy compacts,” in Review of Progress in Quantitative NDE, vol. 16B, Plenum Press, New York, pp. 2005–2012 (1997).
3. S. Makarov, R. Ludwig, and D. Apelian, “Numerical solution of a direct 3D electrostatic resistivity test of green-state metal powder compacts,” in Review of Progress in Quantitative NDE, vol. 17B, Plenum Press, New York, pp. 1462–1470 (1998).
4. R. Ludwig, S. Makarov, and D. Apelian, JNDE 17(2), 153 (1998).
5. R. Ludwig, J. A. McNeill, and J. A. Stander, US Patent 6,218,846 (17 April 2001).