[1] Paizs B, et al. Fragmentation pathways of protonated peptides. Mass Spectrom Rev. 2005 Jul-Aug;24(4):508-48. DOI:
10.1002/mas.20024[2] Kricheldorf H R, et al. 15N NMR spectroscopy 14. Neighboring residue effects in glycine‐containing polypeptides[J]. Die Makromolekulare Chemie: Macromolecular Chemistry and Physics, 1979, 180(1): 161-174.