Protomers: formation, separation and characterization via travelling wave ion mobility mass spectrometry - Lalli, Priscila M; Iglesias, Bernardo Almeida; Toma, Henrique Eisi; Sa, Gilberto Fernandes de; Daroda, Romeu J; Silva Filho, Juvenal Carolino da; Szulejko, Jan E; Araki, Koiti; Eberlin, Marcos Nogueira (Journal of Mass Spectrometry, 2012)