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Acta Physica Polonica A > 1998 > 94 > 3 > 374-378
Acta Physica Polonica A > 1997 > 92 > 4 > 809-814
Acta Physica Polonica A > 1998 > 94 > 3 > 374-378
Acta Physica Polonica A > 1997 > 92 > 4 > 809-814