1. Unidade Acadêmica do Cabo de Santo Agostinho, UFRPE/Rural Federal University of Pernambuco, BR 101 Sul, Cabo de Santo Agostinho 54503-900, PE, Brazil
2. Institute of Electrophysics, Ural Branch of Russian Academy of Sciences, Yekaterinburg 620016, Russia
3. Skolkovo Institute of Science and Technology, Moscow 121205, Russia
4. Departamento de Matemática, Centro Politécnico, UFPR/Federal University of Paraná, Jardim das Américas, Caixa Postal 19081, Curitiba 81531-980, PR, Brazil