@article{10_37236_915,
     author = {Chun-Yen Shen},
     title = {Quantitative sum product estimates on different sets},
     journal = {The electronic journal of combinatorics},
     year = {2008},
     volume = {15},
     doi = {10.37236/915},
     zbl = {1171.11014},
     url = {http://geodesic.mathdoc.fr/articles/10.37236/915/}
}