Nisbet J A, Owen J A
Clin Chim Acta. 1979 Mar 15;92(3):367-71. doi: 10.1016/0009-8981(79)90215-8.
Calibration drift was studied in the automated on-line determination of calcium and magnesium by atomic absorption over periods of up to four hours. Automatic correlation for drift improved the precision of results.