W. Schramm

An application of gas chromatography mass spectrometry to the quantitation of substances and their labelled variants.

W. Schill, T. Louton, H. Hoppen, 1980, Biomedical mass spectrometry.

Simultaneous quantitative estimates of several isotopically labelled substances in the picogram range with selected ion monitoring.

W. Schill, T. Louton, W. Schramm, 1979, Biomedical mass spectrometry.

A two‐dimensional analysis of variance for the simultaneous quantitative determination of estradiol and its 4‐14C isotopically labelled analogue with selected ion monitoring

W. Schill, T. Louton, W. Schramm, 1981 .

Selected ion monitoring: a new approach for the specific determination of steroids in the lower picogram range.

R. Knuppen, H. Hoppen, W. Schramm, 1979, Journal of steroid biochemistry.