Schulz-Dobrick, M., & Schnell, I. (2005). H-2 Chemical-shift resolution and dipolar H-2-H-1, H-2-N-15 correlations in solid-state MAS NMR spectroscopy for structure determination and distance measurements in hydrogen-bonded systems. Central European Journal of Chemistry, 3(2), 245-251. doi:10.2478/BF02551530.