TY - RPRT TI - Chemical shift referencing in MAS solid state NMR. AU - Corey R Morcombe AU - Kurt W Zilm PY - 2003 DO - 10.1016/s1090-7807(03)00082-x UR - https://pubmed.ncbi.nlm.nih.gov/12810033/ ID - 12810033 ER -