Influence of vacancies on the electronic structure of Co2-xZrSn Heusler alloys A. Ślebarski, A. Jezierski, M. Neumann and S. Plogmann Eur. Phys. J. B, 12 4 (1999) 519-523 Published online: 15 December 1999 DOI: 10.1007/s100510051034