by International conference on positron annihilation (10th : 19 | .
by International conference on positron annihilation (11th : 1997 : Kansas City, Missouri, USA) | .
by International conference on positron annihilation (12th : 2000 : Munchen, Germany) | .
by International conference on positron annihilation (13th : 2003 : Kyoto, Japan) | .
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