N-glycoproteomics in plants: Perspectives and challenges: Plant Proteomics in Europe - WEI SONG; HENQUET, Maurice G. L; MENTINK, Remco A; JAN VAN DIJK, Aalt; CORDEWENER, Jan H. G; BOSCH, Dirk; AMERICA, Antoine H. P; VAN DER KROL, Alexander R (Journal of proteomics, 2011)