Increased Resolution and Improved Spectral Quality in Four-Dimensional 13C/13C-Separated HMQC-NOESY-HMQC Spectra Using Pulsed Field GradientsG.W. Vuister; G.M. Clore; A.M. Gronenborn; R. Powers; D.S. Garrett; R. Tschudin; A. Bax · 1993