Presentation of solutions of impulsive fractional Langevin equations and existence results - Impulsive fractional Langevin equationsJ. Wang, M. Fec̆kan and Y. ZhouEur. Phys. J. Special Topics, 222 8 (2013) 1857-1874DOI: https://doi.org/10.1140/epjst/e2013-01969-9