@article{SIGMA_2012_8_a105,
     author = {Concepci\'on Muriel and Juan Luis Romero},
     title = {Nonlocal {Symmetries,} {Telescopic} {Vector} {Fields} and $\lambda${-Symmetries} of {Ordinary} {Differential} {Equations}},
     journal = {Symmetry, integrability and geometry: methods and applications},
     year = {2012},
     volume = {8},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SIGMA_2012_8_a105/}
}