Belishev, M.I. 2008. “Dynamical Inverse Problem for the Equation ð’°áµ¼áµ¼ âˆ’ Î”ð’° âˆ’ âˆ‡lnðœŒ · âˆ‡ð’° = (the BC Method)”. CUBO, A Mathematical Journal 10 (2):15–30. https://www.perspectivasdelacomunicacion.cl/ojs/index.php/cubo/article/view/1513.