1. Professor, Study Center of Mathematics, Universidad Tecnológica de La Habana José Antonio Echeverría, CUJAE, Marianao, La Habana CP 19390, Cuba.
2. Research Scientist, Institute for Software Integrated Systems, Vanderbilt Univ., Nashville, TN 37235.
3. Professor, Dept. of Automation, Universidad Tecnológica de la Habana José Antonio Echeverría, CUJAE, Marianao, La Habana CP 19390, Cuba (corresponding author). ORCID: .