@article{10_2307_121089,
     author = {Neil S. Trudinger and Xu-Jia Wang},
     title = {Hessian measures. {II}},
     journal = {Annals of mathematics},
     year = {1999},
     volume = {150},
     number = {2},
     doi = {10.2307/121089},
     zbl = {0947.35055},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/121089/}
}