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APA Citation
Castillo, J. M., & Morales, D. (2022). the Butterfly lemma. Nonlinear analysis, 215, . http://access.bl.uk/ark:/81055/vdc_100146363217.0x000038
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Castillo, J. M., & Morales, D. (2022). the Butterfly lemma. Nonlinear analysis, 215, . http://access.bl.uk/ark:/81055/vdc_100146363217.0x000038