Characterization of chemical shift tensors via heteronuclear MAS NMR spectroscopy using the REDOR sequence ( 00JB153-18 ) DRAWS experiment to measure 13C-13C distances in several dodecamers ( 96SSNMR211-7 , 97JCP1-107 ) Dependence of 13C chemical shifts on conformations of RNA from CPMAS experiments ( 01JMR1-150 ) Characterization of hydrogen bonding in RNAs ( 05JB331-31 )