Pham, T. N., Griffin, J. M., Masiero, S., Lena, S., Gottarelli, G., Hodgkinson, P., …Brown, S. P. (2007). Quantifying hydrogen-bonding strength: the measurement of (2h)J(NN) couplings in self-assembled guanosines by solid-state (15)N spin-echo MAS NMR. Physical Chemistry Chemical Physics, 9(26), 3416-3423. https://doi.org/10.1039/b703513f