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M. Borovinsek, M. Vesenjak, M. Ulbin, B. Alzahabi and Z. Ren
Paper 207 from CCP: 84, ISBN 1-905088-11-6 (2006)
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M. Ulbin, Z. Ren and J. Flasker
Paper 3.4 from CCP: 38, ISBN 0-948749-40-7 (1996)