In this note we prove a simple relation between the mean curvature form, symplectic area, and the Maslov class of a Lagrangian immersion in a Kähler-Einstein manifold. An immediate consequence is that in Kähler-Einstein manifolds with positive scalar curvature, minimal Lagrangian immersions are monotone.
"A note on mean curvature, Maslov class and symplectic area of Lagrangian immersions." J. Symplectic Geom. 2 (2) 261 - 266, August, 2004.