INVERSE PROBLEM PROBLEMA INVERSO 6 AUTOVALORES 3 DIMENSION ESPECTRAL 3 ECUACION DE TRANSPORTE RADIATIVO 3 EIGENVALUES 3 ESPECTROSCOPIA DEL INFRARROJO CERCANO 3 NEAR INFRARED SPECTROSCOPY 3 NODAL POINTS 3 OPTICAL TOMOGRAPHY 3 PROPAGACION DE LA RADIACION EN LA MATERIA 3 PUNTOS NODALES 3 RADIATION TRANSPORT THROUGH MATTER 3 RADIATIVE TRANSFER EQUATION 3 SPECTRAL DIMENSION 3 TOMOGRAFIA OPTICA 3 Μ-LAPLACIAN 3 Μ-LAPLACIANO 3