Resume
This work is cataloged in the Scientific Portal. Officially published in Springer Proceedings in Mathematics & Statistics (2021). Referenced as: "Teresa Pereira, M.; Lopes, Cristina; Ferreira, Luís Pinto; Oliveira, Silvana".
The complete abstract and full text can be accessed directly at the official DOI: https://doi.org/10.1007/978-3-030-85476-8_9