Kadam, R.M., Seshagiri, T.K., Natarajan, V., Godbole, S.V.
Nuclear Instruments and Methods in Physics Research, Section B: Beam Interactions with Materials and Atoms, Vol. 266, issue 24, 2008, pp. 5137 - 5143
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http://dx.doi.org/ 10.1016/j.nimb.2008.10.003