@article{RM_2011_66_4_a1,
     author = {M. I. Zelikin},
     title = {Theory of fields of extremals for multiple integrals},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {733--765},
     publisher = {mathdoc},
     volume = {66},
     number = {4},
     year = {2011},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2011_66_4_a1/}
}