Low-Overhead Fault-Tolerance for the Preconditioned Conjugate Gradient Solver. Proceedings of the International Symposium on Defect and Fault Tolerance in VLSI and Nanotechnology Systems (DFT'15), 60-65, 2015. [PUMA: ABFT CG PCG SimTech conjugate error error-correction error-detection fault fault-tolerance gradient linear myown preconditioned solver sparse system]