@article{JEMS_2013_15_2_a6,
     author = {Saugata Basu and Andrei Gabrielov and Nicolai Vorobjov},
     title = {Semi-monotone sets},
     journal = {Journal of the European Mathematical Society},
     pages = {635--657},
     publisher = {mathdoc},
     volume = {15},
     number = {2},
     year = {2013},
     doi = {10.4171/jems/369},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/jems/369/}
}