TY  - RPRT
TI  - Piezoelectric pecking key.
AU  - F Altman
AU  - L D Hull
PY  - 1973
DO  - 10.1901/jeab.1973.19-289
UR  - https://pubmed.ncbi.nlm.nih.gov/16811664/
ID  - 16811664
ER  -