Identification of rhizobial strains nodulating Pisum Sativum in northern spain soils by MALDI-TOF MS (matrix-assisted laser desorption ionization time-of-flight mass spectrometry) analysis - Martínez-Molina E; Juanes F; Carro L; Flores-Félix J; Martínez-Hidalgo P; Castillo E; Buitrago J; Velázquez E (Biological Nitrogen Fixation And Beneficial Plant-Microbe Interaction, 2016)