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APA Citation
Yakubov, S. (. (2021). Completeness of root functions of regular differential operators. London : Routledge. http://access.bl.uk/ark:/81055/vdc_100139147303.0x000001
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Yakubov, S. (. (2021). Completeness of root functions of regular differential operators. London : Routledge. http://access.bl.uk/ark:/81055/vdc_100139147303.0x000001