@article{GT_2010_14_1_a13,
     author = {Chernov, Vladimir and Nemirovski, Stefan},
     title = {Non-negative {Legendrian} isotopy in {ST\ensuremath{*}M}},
     journal = {Geometry & topology},
     pages = {611--626},
     publisher = {mathdoc},
     volume = {14},
     number = {1},
     year = {2010},
     doi = {10.2140/gt.2010.14.611},
     url = {http://geodesic.mathdoc.fr/articles/10.2140/gt.2010.14.611/}
}