Links
[1] https://www.hootsgo.org/?q=node/6379
[2] http://en.wikipedia.org/wiki/Uncertainty_and_errors_in_cfd_simulation
[3] http://www.ece.rochester.edu/courses/ECE111/error_uncertainty.pdf
[4] http://www.nhn.ou.edu/~johnson/Education/Juniorlab/Error-SigFig/SigFiginError-043.pdf
[5] https://www.physics.upenn.edu/uglabs/lab_manual/Error_Analysis.pdf