Romero J L

Publications in Math-Net.Ru

1. Nonlocal Symmetries, Telescopic Vector Fields and $\lambda$-Symmetries of Ordinary Differential Equations
   
   SIGMA, 8 (2012), 106, 21 pp.
2. Prolongations of Vector Fields and the Invariants-by-Derivation Property
   
   TMF, 133:2 (2002),  289–300