Springer Verlag, TEST, 3(16), p. 456-458
DOI: 10.1007/s11749-007-0085-3
Springer Verlag, TEST, 3(16), p. 465-467
DOI: 10.1007/s11749-007-0088-0
Springer Verlag, TEST, 3(16), p. 462-464
DOI: 10.1007/s11749-007-0087-1
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