@article{DMGT_2007_27_2_a5,
     author = {Peng, Yuejian},
     title = {Subgraph densities in hypergraphs},
     journal = {Discussiones Mathematicae. Graph Theory},
     pages = {281--297},
     year = {2007},
     volume = {27},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/DMGT_2007_27_2_a5/}
}