Toru Kawano Keiji Goto Toyohiko Ishihara Analysis Method of Ground Wave Propagation over Land-to-Sea Mixed-Path by Using Helmholtz-Kirchhoff Integral Theorem. 10-17 2011 94-C IEICE Trans. Electron. 1 https://doi.org/10.1587/transele.E94.C.10 http://search.ieice.org/bin/summary.php?id=e94-c_1_10 db/journals/ieicet/ieicet94c.html#KawanoGI11