@article{10_21136_CMJ_1982_101817,
     author = {Ferr\'andez, Angel and Naveira, Antonio Mart{\'\i}nez},
     title = {Normal form of the {NK-curvature} operators},
     journal = {Czechoslovak Mathematical Journal},
     pages = {404--417},
     publisher = {mathdoc},
     volume = {32},
     number = {3},
     year = {1982},
     doi = {10.21136/CMJ.1982.101817},
     mrnumber = {669783},
     zbl = {0532.53053},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1982.101817/}
}