1. Program in Mathematics ‐ Federal University of Pará Augusto Corrêa Street, 01 Belém–PA 66075‐110 Brazil
2. Faculty of Mathematics ‐Federal University of Pará Raimundo Santana Street, s/n Salinópolis–PA 68721‐000 Brazil
3. Universidade Zambeze, Faculdade de Ciências e Tecnologia Av. Alfredo Lawley, n° 1018, Matacuane Beira/Sofala Moçambique
4. Faculty of Petroleum Engineering ‐ Federal University of Pará Raimundo Santana Street, s/n Salinópolis–PA 68721‐000 Brazil