@article{10_4153_CMB_1992_060_x,
     author = {Blair, D. E. and Perrone, D.},
     title = {A {Variational} {Characterization} of {Contact} {Metric} {Manifolds} {With} {Vanishing} {Torsion}},
     journal = {Canadian mathematical bulletin},
     pages = {455--462},
     year = {1992},
     volume = {35},
     number = {4},
     doi = {10.4153/CMB-1992-060-x},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1992-060-x/}
}