@article{10_4064_ap_72_2_153_158,
     author = {Gaetano Zampieri},
     title = {Gradients and canonical transformations},
     journal = {Annales Polonici Mathematici},
     pages = {153--158},
     publisher = {mathdoc},
     volume = {72},
     number = {2},
     year = {1999},
     doi = {10.4064/ap-72-2-153-158},
     language = {fr},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-72-2-153-158/}
}