TY  - RPRT
TI  - Serial and parallel multilevel systems.
AU  - E Kyrölä
AU  - M Lindberg
PY  - 1987
DO  - 10.1103/physreva.35.4207
UR  - https://pubmed.ncbi.nlm.nih.gov/9898011/
ID  - 9898011
ER  -