On Diophantine quintuples and $D(-1)$-quadruples (bibtex)
by Christian Elsholtz, Alan Filipin, Yasutsugu Fujita
Reference:
Christian Elsholtz, Alan Filipin, Yasutsugu Fujita, On Diophantine quintuples and $D(-1)$-quadruples, Monatshefte für Mathematik, 175, 227-239, (2014).
Bibtex Entry:
@article{elsholtz5,
   author  = {Christian Elsholtz and Alan Filipin and Yasutsugu Fujita},
   title   = {On {D}iophantine quintuples and $D(-1)$-quadruples},
   journal = {Monatshefte f\"ur Mathematik},
   volume  = {175},
   year    = {2014},
   pages   = {227-239},
   url     = {http://www.math.tugraz.at/~elsholtz/WWW/papers/elsholtz-filipin-fujitaNumDQIIIv19.pdf},
   doi     = {10.1007/s00605-013-0571-5},
  MRNUMBER = {3260867},
}