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2. Thesis, Polyteknisk Forlag, DK-2800 Lyngby, Denmark, 1979
3. , , , and . Rep. TKKF-A443, Helsinki Univ. of Technology, Department of Technical Physics, SF-02150 Espoo 15, Finland.
4. The effect of microvoid size on positron annihilation characteristics and residual resistivity in metals