1. Lect. Notes Math.;R. L. Bryant,1987
2. Chen. B.-Y.: Geometry of Submanifolds and its Applications. Science University of Tokyo (1981)
3. Dazord, P.: Sur la géometrie des sous-fibrés et des feuilletages lagrangiense. Ann. Sci. Éc. Norm. Super., IV. Ser.13, 465–480 (1981)
4. Floer, A.: Morse theory of Lagangian intersections. J. Differ. Geom.28, 513–547 (1988)
5. Harvey, R., Lawson, B.: Calibrated geometries. Acta Math.148, 47–157 (1982)