Gary E. Martin, Bruce D. Hilton, Kirill A. Blinov, Antony J. Williams.
Multistep correlations via covariance processing of COSY/GCOSY spectra: opportunities and artifacts , Magn. Reson. Chem. 2008, 46, 997–1002An application of Covariance NMR to examine strychnine and NMR assignments using COSY spectrocopy