Article:Math.DG/0111324/unidentified-references
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D. Gilbarg and N.S. Trudinger, {\it Elliptic Partial Differential Equations of Second Order}, Classics in Mathematics, Springer--Verlag, Berlin, 2001.
R.\ Harvey and H.B.\ Lawson, {\it Calibrated geometries}, Acta Mathematica 148 (1982), 47--157.
C.B. Morrey, {\it Multiple Integrals in the Calculus of Variations}, Grund. der math. Wiss. 130, Springer, Berlin, 1966.
