Geodesic
Viscosity approach to optimal property of $l$-minimal surfaces
Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 24, Tome 200 (1992), pp. 71-82 
N. M. Ivochkina. Viscosity approach to optimal property of $l$-minimal surfaces. Zapiski Nauchnykh Seminarov POMI, Boundary-value problems of mathematical physics and related problems of function theory. Part 24, Tome 200 (1992), pp. 71-82. http://geodesic.mathdoc.fr/item/ZNSL_1992_200_a6/
@article{ZNSL_1992_200_a6,
     author = {N. M. Ivochkina},
     title = {Viscosity approach to optimal property of $l$-minimal surfaces},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {71--82},
     year = {1992},
     volume = {200},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1992_200_a6/}
}
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Voir la notice du chapitre de livre provenant de la source Math-Net.Ru

The optimal property of the solutions to $l$-curvature homogeneous equations is described in viscosity terms.