Last name: 
Pereira
First name: 
Ducival C.
Name variants: 
Pereira, Ducival Carvalho
Orcid ID: 
0000-0003-4511-0185
External ID: 
https://scholar.google.com.br/citations?user=lACsrNgAAAAJ&hl=pt-BR
Institution relationship: 
State University of Pará, Department of Mathematics