TY  - RPRT
TI  - The flame photometric determination of calcium in phosphate, carbonate, and silicate rocks
AU  - Henry Kramer
PY  - 1957
DO  - 10.1016/s0003-2670(00)87078-6
UR  - https://pubs.usgs.gov/publication/70009850
ID  - 70009850
ER  -