@article{JEMS_2007_9_1_a0,
     author = {Arkady Poliakovsky},
     title = {Upper bounds for singular perturbation problems involving gradient fields},
     journal = {Journal of the European Mathematical Society},
     pages = {1--43},
     publisher = {mathdoc},
     volume = {9},
     number = {1},
     year = {2007},
     doi = {10.4171/jems/70},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/70/}
}