By Andresen E.   Anders M.   in COMPEL: Int J for Computation and Maths. in Electrical and Electronic Eng.

ISSN:0332-1649|17|2|189-195

Emerald Group Publishing Ltd‎(1998)‎

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By Andresen E. M.   Mitchell G. R.   in EPL (EUROPHYSICS LETTERS)

ISSN:0295-5075|43|3|296-301

Edp Sciences‎(2010)‎

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