Bernstein01'

@article{DBLP:journals/moc/Bernstein01,
  author    = {Daniel J. Bernstein},
  title     = {Enumerating solutions to p(a) + q(b) = r(c) + s(d)},
  journal   = {Math. Comput.},
  volume    = {70},
  number    = {233},
  year      = {2001},
  pages     = {389-394},
  ee        = {http://dx.doi.org/10.1090/S0025-5718-00-01219-9},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}