Institution: | aDepartment of Natural Resources and Environmental Engineering, Vigo University, E.T.S.I. MINAS, 36310 Vigo, Spain;bDepartment of Statistics, Vigo University, E.T.S.I. MINAS, 36310 Vigo, Spain;cDepartment of Mining Exploitation and Prospection, Oviedo University, 33004 Oviedo, Spain;dDepartment of Applied Mathematics, Oviedo University, 33004 Oviedo, Spain |