Kondratiev, Yuri
Silva, José Luís da http://orcid.org/0000-0002-5207-1703
Funding for this research was provided by:
Fundação para a Ciência e a Tecnologia (UIDB/MAT/04674/2020)
Ministry for Science and Education of Ukraine (0119U002583)
Article History
Received: 2 March 2020
Accepted: 24 March 2021
First Online: 31 March 2021