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Systems Science > 2004 > Vol. 30, no 2 > 11-20
Systems Science > 2003 > Vol. 29, nr 2 > 5-16
Systems Science > 2003 > Vol. 29, nr 4 > 55-67
Systems Science > 2003 > Vol. 29, nr 4 > 19-27
Journal of Technical Physics > 2001 > Vol. 42, no 4 > 459-474