@article{AFM_2018_43_1_a16,
     author = {Sebastiano Golo},
     title = {Some remarks on contact variations in the first {Heisenberg} group},
     journal = {Annales Fennici Mathematici},
     pages = {311--335},
     publisher = {mathdoc},
     volume = {43},
     number = {1},
     year = {2018},
     doi = {10.5186/aasfm.2018.4312},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.5186/aasfm.2018.4312/}
}