\bib{2001/bernstein-sortedsums}
\yr 2001
\by Daniel J. Bernstein
\paper Enumerating solutions to $p(a)+q(b)=r(c)+s(d)$
\jour Mathematics of Computation
\issn 0025--5718
\vol 70
\pages 389--394
\url http://cr.yp.to/papers.html
\endref