RT Journal Article T1 Practical approximations for multivariate characteristics of risk processes A1 Usabel Rodrigo, Miguel Arturo PB Elsevier SN 0167-6687 YR 1999 FD 1999-12 LK https://hdl.handle.net/10016/12756 UL https://hdl.handle.net/10016/12756 LA eng NO The author gratefully acknowledges the financia support from: Bacas de Perfeccionamientode Doctores en el Extranjero, 1999, MEC, Spain DS e-Archivo RD 1 sept. 2024