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Sánchez-Chávez, E.; Muñoz-Marquez, E.; Garcia-Bañuelos, M. L.; Anchondo-Najera, A.; Guerrero-Prieto, V. M.; Nuñez-Barrios, A.; Ruiz-Saez, J. M.; Romero-Monreal, L. M. Influence of Nitrogen Fertilization on K+, Mg2+ and Ca2+ Concentrations and on Its Bioindicators in Roots and Leaves of Green Bean Plants. Span. j. agric. res. 2010, 8, 1137-1146.