RT Journal Article SR Electronic(1) A1 Cerqueira Neto, J.X.YR 1991 T1 Equaçőes de Helmholtz de Ondas-P, S no Meio de Biot JF , VO OP SP cp-316-00086 DO https://doi.org/10.3997/2214-4609-pdb.316.86 PB European Association of Geoscientists & Engineers, SN 2214-4609, AB , UL https://www.earthdoc.org/content/papers/10.3997/2214-4609-pdb.316.86