Copyright (C) 2009-2019 Ovidio Peña <ovidio@bytesfall.com>
    Copyright (C) 2013-2019 Konstantin Ladutenko <kostyfisik@gmail.com>

    This program is free software: you can redistribute it and/or modify
    it under the terms of the GNU General Public License as published by
    the Free Software Foundation, either version 3 of the License, or
    (at your option) any later version.

    This program is distributed in the hope that it will be useful,
    but WITHOUT ANY WARRANTY; without even the implied warranty of
    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
    GNU General Public License for more details.

    The only additional remark is that we expect that all publications
    describing work using this software, or all commercial products
    using it, cite at least one of the following references:
    [1] O. Peña and U. Pal, "Scattering of electromagnetic radiation by
        a multilayered sphere," Computer Physics Communications,
        vol. 180, Nov. 2009, pp. 2348-2354.
    [2] K. Ladutenko, U. Pal, A. Rivera, and O. Peña-Rodríguez, "Mie
        calculation of electromagnetic near-field for a multilayered
        sphere," Computer Physics Communications, vol. 214, May 2017,
        pp. 225-230.

    You should have received a copy of the GNU General Public License
    along with this program.  If not, see <http://www.gnu.org/licenses/>.