1. S. Ditlea. Spreadsheets Can be Hazardous to Your Health. Personal Computing, 11(1):60--69, 1987.
2. M. M. Burnett, C. Cook, J. Summet, G. Rothermel, and C. Wallace. End-User Software Engineering with Assertions. IEEE Int. Conf. on Software Engineering, pp. 93--103, 2003.
3. R. R. Panko. Spreadsheet Errors: What We Know. What We Think We Can Do. Symp. of the European Spreadsheet Risks Interest Group (EuSpRIG), 2000.
4. G. Rothermel, M. M. Burnett, L. Li, C. DuPuis, and A. Sheretov. A Methodology for Testing Spreadsheets. ACM Transactions on Software Engineering and Methodology, pp. 110--147, 2001.
5. K. Rajalingham, D. R. Chadwick, and B. Knight. Classification of Spreadsheet Errors. Symp. of the European Spread- sheet Risks Interest Group (EuSpRIG), 2001.