Chemo-enzymatic synthesis of 13C labeled complex N-glycans as internal standards for the absolute glycan quantification by mass spectrometry 23/11/2018 Echeverria, B.; Etxebarria, J.; Ruiz, N.; Hernandez, A.; Calvo, J.; Haberger, M.; Reusch, D.; Reichardt, N-C.; Analytical Chemistry, 2015, 87(22), 11460-11467 Link to article