Neunhäuserer, Jörg (2020-10-13). "On the universality of Somos' constant". arXiv:2006.02882 [math.DS].
Guillera, Jesus; Sondow, Jonathan (2008). "Double integrals and infinite products for some classical constants via analytic continuations of Lerch's transcendent". The Ramanujan Journal. 16 (3): 247–270. arXiv:math/0506319. doi:10.1007/s11139-007-9102-0. ISSN1382-4090.
Sondow, Jonathan; Hadjicostas, Petros (2007). "The generalized-Euler-constant function $\gamma(z)$ and a generalization of Somos's quadratic recurrence constant". Journal of Mathematical Analysis and Applications. 332 (1): 292–314. arXiv:math/0610499. Bibcode:2007JMAA..332..292S. doi:10.1016/j.jmaa.2006.09.081.
Guillera, Jesus; Sondow, Jonathan (2008). "Double integrals and infinite products for some classical constants via analytic continuations of Lerch's transcendent". The Ramanujan Journal. 16 (3): 247–270. arXiv:math/0506319. doi:10.1007/s11139-007-9102-0. ISSN1382-4090.
Sondow, Jonathan; Hadjicostas, Petros (2007). "The generalized-Euler-constant function $\gamma(z)$ and a generalization of Somos's quadratic recurrence constant". Journal of Mathematical Analysis and Applications. 332 (1): 292–314. arXiv:math/0610499. Bibcode:2007JMAA..332..292S. doi:10.1016/j.jmaa.2006.09.081.
Sondow, Jonathan; Hadjicostas, Petros (2007). "The generalized-Euler-constant function $\gamma(z)$ and a generalization of Somos's quadratic recurrence constant". Journal of Mathematical Analysis and Applications. 332 (1): 292–314. arXiv:math/0610499. Bibcode:2007JMAA..332..292S. doi:10.1016/j.jmaa.2006.09.081.
Guillera, Jesus; Sondow, Jonathan (2008). "Double integrals and infinite products for some classical constants via analytic continuations of Lerch's transcendent". The Ramanujan Journal. 16 (3): 247–270. arXiv:math/0506319. doi:10.1007/s11139-007-9102-0. ISSN1382-4090.