INTLAB
S.M. Rump, T. Ogita, and S. Oishi: Accurate Floating-point Summation I: Faithful Rounding. en:SIAM Journal on Scientific Computing (SISC), 31(1): 189-224, 2008.
S.M. Rump, T. Ogita, and S. Oishi: Accurate Floating-point Summation II: Sign, K-fold Faithful and Rounding to Nearest. en:SIAM Journal on Scientific Computing (SISC), 31(2):1269-1302, 2008.
S.M. Rump: Ultimately Fast Accurate Summation, en:SIAM Journal on Scientific Computing (SISC), 31(5):3466-3502, 2009.
S.M. Rump. Accurate solution of dense linear systems, Part II: Algorithms using directed rounding. en:Journal of Computational and Applied Mathematics (JCAM), 242:185-212, 2013.