TY  - JOUR
AU  - Mollin, R. A.
AU  - Srinivasan, A.
TI  - Pell Equations: Non-Principal Lagrange Criteria and Central Norms
JO  - Canadian mathematical bulletin
PY  - 2012
SP  - 774
EP  - 782
VL  - 55
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-2011-118-9/
DO  - 10.4153/CMB-2011-118-9
ID  - 10_4153_CMB_2011_118_9
ER  -