@article{10_4064_ap_64_3_253_265,
     author = {Jes\'us \'Alvarez L\'opez},
     title = {On the first secondary invariant of {Molino's} central sheaf},
     journal = {Annales Polonici Mathematici},
     pages = {253--265},
     publisher = {mathdoc},
     volume = {64},
     number = {3},
     year = {1996},
     doi = {10.4064/ap-64-3-253-265},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-64-3-253-265/}
}