SEARCH Articles Figures Tables COSY Correlated spectroscopy double-quantum filtered COSY DQF-COSY (Double-quantum filtering Double quantum filtered Double quantum filtering Double quantum-filtered COSY experiment Double quantum-filtered COSY spectra Double-Quantum Filtered —H COSY Double-quantum [ Double-quantum filtered (DQF>COSY Double-quantum filtering COSY Phase COSY (double quantum filtered Quantum Filters