@article{SIGMA_2005_1_a21,
     author = {Yuri Bozhkov},
     title = {Noether {Symmetries} and {Critical} {Exponents}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2005},
     volume = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2005_1_a21/}
}