TY  - JOUR
AU  - Everitt, William Norrie
AU  - Giertz, Magnus
TI  - On the limit-3 classification of the square of a second-order, linear differential expression
JO  - Czechoslovak Mathematical Journal
PY  - 1976
SP  - 653
EP  - 665
VL  - 26
IS  - 4
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1976.101437/
DO  - 10.21136/CMJ.1976.101437
LA  - en
ID  - 10_21136_CMJ_1976_101437
ER  -