%0 Journal Article %A Boyadzhiev, Georgi %T Bi-Characteristic Curves of Body and Surface Waves and Application in Geophysics %J Serdica Mathematical Journal %D 2015 %P 513-526 %V 41 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/item/SMJ2_2015_41_4_a11/ %G en %F SMJ2_2015_41_4_a11