TY  - RPRT
TI  - Penfold and Salmon reply.
AU  - IT Penfold
AU  - PS Salmon
PY  - 1992
DO  - 10.1103/physrevlett.68.253
UR  - https://pubmed.ncbi.nlm.nih.gov/10045575/
ID  - 10045575
ER  -