@article{1988-elkies
,author={Noam D. Elkies}
,ISSN={0025--5718}
,journal={Mathematics of Computation}
,MR={89h:11012}
,pages={825--835}
,title={{On $A^4+B^4+C^4=D^4$}}
,volume={51}
,year={1988}
}