References
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H. Lee and C. Ryoo, A note of recurrence formula for values of the Euler zeta functions
${\zeta}_E(2n)$ at positive integers, Bull. Korean Math. Soc. 51 (2014), no. 5, 1425-1432. https://doi.org/10.4134/BKMS.2014.51.5.1425 - M. H. Protter and C. B. Morrey, A First Course in Real Analysis, Springer-Verlag (1991).