@article{SIGMA_2013_9_a37,
     author = {Debra Lewis},
     title = {Relative {Critical} {Points}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2013},
     volume = {9},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2013_9_a37/}
}