Improvements in target ranging by HF radar using the European ionospheric model PRIME Bourdillon, A. ; de Franceschi, G. ; Zolesi, B. ; Le Roux, Y. Abstract Publication: Physics and Chemistry of the Earth C Pub Date: April 1999 DOI: 10.1016/S1464-1917(99)00003-3 Bibcode: 1999PCEC...24..305B