@article{10_4064_cm118_2_3,
     author = {B. Helffer},
     title = {The {Montgomery}  model revisited},
     journal = {Colloquium Mathematicum},
     pages = {391--400},
     publisher = {mathdoc},
     volume = {118},
     number = {2},
     year = {2010},
     doi = {10.4064/cm118-2-3},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/cm118-2-3/}
}