arxiv ref: 1404.6469Title: Determination of Strange Sea Quark Distributions from Fixed-target and Collider DataAuthors: S. Alekhin, J. Bluemlein, L. Caminadac, K. Lipka, K. Lohwasser, S. Moch, R. Petti, R. PlacakyteNode: DESYSupervisor: BluemleinWork Packages: WP3: ToolsMilestones: M3.3.3 Improved PDFs using LHC data