TY  - RPRT
TI  - Variations in mechanical sampling: their causes and effects.
AU  - A S McLelland
AU  - A Fleck
AU  - D Wagstaff
AU  - R Robinson
PY  - 1975
DO  - 10.1177/000456327501200135
UR  - https://pubmed.ncbi.nlm.nih.gov/15637910/
ID  - 15637910
ER  -