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(1) K. Nordlund, J. Keinonen , T. Mattila, Physical review letters 77 (1996), 699
(2) A. Ito, H. Nakamura, Commun. Comput. Phys. 4 (2008) 592.

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(3) A. Gulans, A. V. Krasheninnikov, M. J. Puska, R. M. Nieminen, Physical Review B 84 (2011) 024114.
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