@article{ZNSL_2006_336_a3,
     author = {N. M. Ivochkina},
     title = {Weakly first-order interior estimates and {Hessian} equations},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {55--66},
     publisher = {mathdoc},
     volume = {336},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_2006_336_a3/}
}