An e+ e- top factory in a 50-TeV + 50-TeV hadron collider tunnel Norem, J. ; Jagger, J. ; Sharma, S. ; Keil, E. ; Foster, G. W. ; Malamud, E. ; Chojnacki, E. ; Winn, D. Abstract Publication: 17th IEEE Particle Accelerator Conference Pub Date: 1998 Bibcode: 1998pac..conf..363N