S. Delladio, SPECIAL GENERALIZED GAUSS GRAPHS AND THEIR APPLICATION TO MINIMIZATION OF FUNCTIONALS INVOLVING CURVATURES, Journal fur die Reine und Angewandte Mathematik, 486, 1997, pp. 17-43
We introduce a special class of surfaces for which a generalized notio
n of curvature tensor can be defined and nice properties, with respect
to compactness and semicontinuity, hold. Some applications are given.