TY  - RPRT
TI  - Geometrical approach to the nonlinear sigma model.
AU  - NM Chepilko
AU  - K Fujii
AU  - AP Kobushkin
PY  - 1991
DO  - 10.1103/physrevd.43.2391
UR  - https://pubmed.ncbi.nlm.nih.gov/10013621/
ID  - 10013621
ER  -