Cite
MLA Citation
Jesús M.F. Castillo and Daniel Morales. “The Butterfly lemma.” Nonlinear analysis, vol. 215, 2022, p. . http://access.bl.uk/ark:/81055/vdc_100146363217.0x000038
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Jesús M.F. Castillo and Daniel Morales. “The Butterfly lemma.” Nonlinear analysis, vol. 215, 2022, p. . http://access.bl.uk/ark:/81055/vdc_100146363217.0x000038