Chen, C. H.C. H.Chen江衍偉Kiang, Yean-WoeiYean-WoeiKiang2009-02-042018-07-062009-02-042018-07-061981-05http://ntur.lib.ntu.edu.tw//handle/246246/120414en-USA Variational Theory for Wave Propagation in a One-Dimensional Inhomogeneous Mediumjournal article