@article{SM_2008_199_12_a1,
     author = {V. V. Zhikov and S. E. Pastukhova},
     title = {Improved integrability of the gradients of solutions of elliptic equations with variable nonlinearity exponent},
     journal = {Sbornik. Mathematics},
     pages = {1751--1782},
     publisher = {mathdoc},
     volume = {199},
     number = {12},
     year = {2008},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2008_199_12_a1/}
}