Positron Annihilation Characteristics in Perfect and Imperfect Transition Metal Carbides and Nitrides M. J. Puska, M. Sob, G. Brauer et T. KorhonenJ. Phys. IV France, 05 C1 (1995) C1-135-C1-142DOI: https://doi.org/10.1051/jp4:1995115