DETECTION OF BOUND VORTEX-ANTIVORTEX PAIRS IN A SUPERCONDUCTING THIN FILM BY SURFACE ACOUSTIC WAVES A. SCHENSTROM, M. LEVY, H.P. FREDRICKSEN et J. GAVALER J. Phys. Colloques, 46 C10 (1985) C10-703-C10-706 DOI: 10.1051/jphyscol:198510154