Two-point paraxial traveltime formula for inhomogeneous isotropic and anisotropic media: Tests of accuracy Waheed, Umair bin ; Pšenčík, Ivan ; Červený, Vlastislav ; Iversen, Einar ; Alkhalifah, Tariq Abstract Publication: Geophysics Pub Date: June 2013 DOI: 10.1190/geo2012-0406.1 Bibcode: 2013Geop...78C..41W