A constitutive equation and generalized Gassmann modulus for multimineral porous media Carcione, José M. ; Helle, Hans B. ; Santos, Juan E. ; Ravazzoli, Claudia L. Abstract Publication: Geophysics Pub Date: 2005 DOI: 10.1190/1.1897035 Bibcode: 2005Geop...70...17C