A simple game to derive lognormal distribution. (English)
Int. J. Math. Educ. Sci. Technol. 38, No. 5, 689-695 (2007).
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Stability criteria for differential equations with variable time delays. (English)
Int. J. Math. Educ. Sci. Technol. 33, No. 3, 359-375 (2002).
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