R. Heidel

Excitation stand for spectrographic analysis: A new design

V. Fassel, R. H. Heidel, H. D. Cook, 1953 .

Fluorescence Spectrometric Determination of Terbium

V. Fassel, R. H. Heidel, R. Heidel, 1954 .

X-Ray Fluorescent Spectrometric Determination of Yttrium in Rare Earth Mixtures

V. Fassel, R. Heidel, 1958 .