Metal-enriched plasma in protogalactic halos - A survey of N V absorption in high-z damped and sub-damped Lyman- systemsA. J. Fox, J. X. Prochaska, C. Ledoux, P. Petitjean, A. M. Wolfe and R. SrianandA&A, 503 3 (2009) 731-746DOI: https://doi.org/10.1051/0004-6361/200911717
systems systems