BibTeX
@TECHREPORT{
         Sei1994GCo,
       AUTHOR = "A. Sei and William W. Symes",
       TITLE = "Gradient Calculation of the Travel Time Cost Function without Ray-Tracing",
       INSTITUTION = "Center for Research in Parallel Computation, Rice University",
       YEAR = "1994",
       TYPE = "{T}ech. {R}eport",
       NUMBER = "CRPC--TR94381",
       ADDRESS = "Houston, Tex.",
       REFERRED = "[Goldman1996AAM]."
}