arxiv ref: 1407.2537Title: Recent Symbolic Summation Methods to Solve Coupled Systems of Differential and Difference EquationsAuthors: J. Bluemlein, A. De Freitas, C. SchneiderNode: DESYSupervisor: BluemleinWork Packages: WP3: ToolsMilestones: M3.3.4 Consistent PDF fits at NNLO