1. Quantitative chemical analysis of individual microparticles using the electron microprobe: Theoretical;Armstrong;Anal. Chem.,1975
2. Quantitative individual particle analysis: A comparison and evaluation of microprobe techniques;Armstrong,1977
3. Precision and accuracy of high resolution isotopic measurements with the ion microprobe and systematics of ion formation;Armstrong,1982
4. Standard CaAl2Si2O8 glasses with various Mg isotopic compositions for ion microprobe characterization;Armstrong,1982
5. Absolute isotopic abundance ratios and atomic weight of a reference sample of silicon;Barnes;J. Res. Nat. Bur. Stand.,1975