TY  - RPRT
TI  - Topological defects of wave patterns.
AU  - P Coullet
AU  - C Elphick
AU  - L Gil
AU  - J Lega
PY  - 1987
DO  - 10.1103/physrevlett.59.884
UR  - https://pubmed.ncbi.nlm.nih.gov/10035897/
ID  - 10035897
ER  -