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MLA Citation
B. N (Boris Nikolaevich) Pshenichnyĭ. Necessary conditions for an extremum. Boca Raton : CRC Press, 2020. http://access.bl.uk/ark:/81055/vdc_100109223156.0x000001
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B. N (Boris Nikolaevich) Pshenichnyĭ. Necessary conditions for an extremum. Boca Raton : CRC Press, 2020. http://access.bl.uk/ark:/81055/vdc_100109223156.0x000001