Velocity asymmetries in young stellar object jets - Intrinsic and extrinsic mechanismsT. Matsakos, N. Vlahakis, K. Tsinganos, K. Karampelas, C. Sauty, V. Cayatte, S. P. Matt, S. Massaglia, E. Trussoni and A. MignoneA&A, 545 (2012) A53DOI: https://doi.org/10.1051/0004-6361/201219498