TY  - BOOK
AU  - Griffiths J C
AU  - Rosenfeld M A
TI  - Operator variation in experimental research
U1  - 000SA.2 
PY  - 1954///
KW  - Operator variations
N1  - Photo copy from Journal of Geo.., V62, no.1, 1954, p.74-91
ER  -