Dobner, Alexander (2020). "A New Proof of Newman's Conjecture and a Generalization". arXiv:2005.05142 [math.NT].
Polymath, D.H.J. (2019). "Effective approximation of heat flow evolution of the Riemann ξ function, and a new upper bound for the de Bruijn-Newman constant". arXiv:1904.12438 [math.NT].(preprint)
Csordas, G.; Norfolk, T. S.; Varga, R. S. (1987-09-01). "A low bound for the de Bruijn-newman constant Λ". Numerische Mathematik. 52 (5): 483–497. doi:10.1007/BF01400887. ISSN0945-3245. S2CID124008641.
te Riele, H. J. J. (1990-12-01). "A new lower bound for the de Bruijn-Newman constant". Numerische Mathematik. 58 (1): 661–667. doi:10.1007/BF01385647. ISSN0945-3245.
Csordas, G.; Norfolk, T. S.; Varga, R. S. (1987-09-01). "A low bound for the de Bruijn-newman constant Λ". Numerische Mathematik. 52 (5): 483–497. doi:10.1007/BF01400887. ISSN0945-3245. S2CID124008641.
Csordas, G.; Norfolk, T. S.; Varga, R. S. (1987-09-01). "A low bound for the de Bruijn-newman constant Λ". Numerische Mathematik. 52 (5): 483–497. doi:10.1007/BF01400887. ISSN0945-3245. S2CID124008641.
te Riele, H. J. J. (1990-12-01). "A new lower bound for the de Bruijn-Newman constant". Numerische Mathematik. 58 (1): 661–667. doi:10.1007/BF01385647. ISSN0945-3245.