@article{SIGMA_2016_12_a23,
     author = {Konrad Sch\"obel},
     title = {Nijenhuis {Integrability} for {Killing} {Tensors}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2016},
     volume = {12},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2016_12_a23/}
}