@article{2001-bernstein-sortedsums
,note={URL: {\tt http://cr.yp.to/papers.html}}
,author={Daniel J. Bernstein}
,ISSN={0025--5718}
,journal={Mathematics of Computation}
,pages={389--394}
,title={{Enumerating solutions to $p(a)+q(b)=r(c)+s(d)$}}
,volume={70}
,year={2001}
}