@article{NUMA_1987__52_5_133248,
     author = {R.S. Varga and G. Csordas and T.S. Norfolk},
     title = {A {Lower} {Bound} for the de {Bruijn-Newman} {Constant} ... .},
     journal = {Numerische Mathematik},
     pages = {483--498},
     publisher = {mathdoc},
     volume = {52},
     number = {5},
     year = {1987},
     zbl = {0663.65017},
     url = {http://geodesic.mathdoc.fr/item/NUMA_1987__52_5_133248/}
}