TY - RPRT TI - Low-temperature solid-state 15N NMR characterization of polypeptide backbone librations. AU - N D Lazo AU - W Hu AU - T A Cross PY - 1995 DO - 10.1006/jmrb.1995.1056 UR - https://pubmed.ncbi.nlm.nih.gov/7538014/ ID - 7538014 ER -