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Acknowledgements
The second author is grateful for the financial support by Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES), Conselho Nacional de Desenvolvimento Científico (CNPq) and Fundação de Apoio a Pesquisa do Distrito Federal (FAPDF). This work was done while the third author was visiting the University of Brasília and the Federal University of Pará. He warmly thanks for the hospitality. He is also grateful for the financial support provided by the Federal University of Cariri and the Federal University of Pará. The authors want to thank the anonymous referee whose report has greatly helped them to improve this paper.
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dos Santos, G.C., Figueiredo, G.M. & Tavares, L.S. Existence Results for Some Anisotropic Singular Problems via Sub-supersolutions. Milan J. Math. 87, 249–272 (2019). https://doi.org/10.1007/s00032-019-00300-8
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DOI: https://doi.org/10.1007/s00032-019-00300-8