9Mechref Y,Novotny M V.Mass spectrometric mapping and sequencing of N-linkedOligosaccharides derived from submicrogram amounts of glycoproteins[J].Anal Chem,1998,70:455-463.
10Fenn J B,et al.Electrospray ionization for the masspectrometry of large molecules[J].Science,1989,246:64-71.