TY  - JOUR
AU  - Dittrich, Jaroslav
TI  - On the topological charge conservation in the three-dimensional ${\rm O}(3)$ $\sigma$-model.
JO  - Applications of Mathematics
PY  - 1984
SP  - 367
EP  - 371
VL  - 29
IS  - 5
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.21136/AM.1984.104106/
DO  - 10.21136/AM.1984.104106
LA  - en
ID  - 10_21136_AM_1984_104106
ER  -