@article{CMUC_1993__34_2_a13,
     author = {Papantoniou, Basil J.},
     title = {Contact manifolds, harmonic curvature tensor and $(k,\mu )$-nullity distribution},
     journal = {Commentationes Mathematicae Universitatis Carolinae},
     pages = {323--334},
     publisher = {mathdoc},
     volume = {34},
     number = {2},
     year = {1993},
     mrnumber = {1241740},
     zbl = {0782.53024},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/CMUC_1993__34_2_a13/}
}