...
1. I.P. Iliev, S. G. Gocheva-Ilieva, D. N. Astadjov, N. P. Denev and N. V. Sabotinov, Statistical analysis of the CuBr laser efficiency improvement, Optics and Laser Technology, vol. 40, issue 4, pp. 641-646, 2008. doi:10.1016/j.optlastec.2007.09.009 .
2. I.P. Iliev, S. G. Gocheva-Ilieva, D. N. Astadjov, N. P. Denev and N. V. Sabotinov, Statistical approach in planning experiments with a copper bromide vapor laser, Quantum Electron., vol. 38, N 5, 436-440, 2008. http://www.iop.org/EJ/abstract/1063-7818/38/5/A04
3. I.P. Iliev and S. G. Gocheva-Ilieva, On the application of the multidimensional statistical techniques for exploring copper bromide vapor laser, The 34th Conference Applications of Mathematics in Engineering and Economics (AMEE'08), June 6 - 12, 2008, Sozopol, CP1067, Applications of Mathematics in Engineering and Economics '34—AMEE '08, edited by M. D. Todorov, American Institute of Physics, 2008, 475-482. http://scitation.aip.org/dbt/dbt.jsp?KEY=APCPCS&Volume=1067&Issue=1
4. I.P. Iliev and S. G. Gocheva-Ilieva, Statistical techniques for examining copper bromide laser parameters, Proceedings of Int. Conf. of Numerical Analysis and Applied Mathematics, ICNAAM 2007, September 16-20, 2007, Conference Proceedings of American Institute of Physics (AIP), vol. CP936, pp. 267-270, 2007. doi:10.1063/1.2790126, http://adsabs.harvard.edu/abs/2007AIPC..936..267I
5. Douglas C. Montgomery, George C. Runger, Applied statistics and probability for engineers, 3rd ed., John Wiley & Sons, Inc., New York, 2002.
6. http://www.itl.nist.gov/div898/handbook/ Engineering statistics handbook, 3119 pages.
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