TY  - JOUR
AU  - Alan Filipin
TI  - An irregular $D(4)$-quadruple cannot be
 extended to a quintuple
JO  - Acta Arithmetica
PY  - 2009
SP  - 167
EP  - 176
VL  - 136
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/aa136-2-5/
DO  - 10.4064/aa136-2-5
LA  - en
ID  - 10_4064_aa136_2_5
ER  -