A. N. Jimenez, J. C. Muñoz Cuartas, S. . Avendaño, and L. Gómez Bernal, “Analysis of the covariance matrix in FWI through density of covariance maps”, CT&F Cienc. Tecnol. Futuro, vol. 10, no. 1, pp. 93–105, Jun. 2020.