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13A variational approach to soliton dynamicsIn R. J. Russell, N. Murphy & A. R. Peacocke (eds.), Chaos and Complexity, Vatican Observatory Publications. pp. 301. 1995.
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8Measuring complexity using information fluctuationIn R. J. Russell, N. Murphy & A. R. Peacocke (eds.), Chaos and Complexity, Vatican Observatory Publications. pp. 303. 1995.