@article{10_2307_120974,
     author = {Gaoyong Zhang},
     title = {A positive solution to the {Busemann-Petty} problem in {\(\mathbb{R}^4\)}},
     journal = {Annals of mathematics},
     year = {1999},
     volume = {149},
     number = {2},
     doi = {10.2307/120974},
     zbl = {0937.52004},
     url = {http://geodesic.mathdoc.fr/articles/10.2307/120974/}
}