2009
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Math. Biosci. Eng. 2009;6:683–700. doi:10.3934/mbe.2009.6.683. .
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Asian-Eur. J. Math. 2009;2:95–115. doi:10.1142/S1793557109000091. .
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Southeast Asian Bull. Math. 2009;33:497–508. .
2008
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Journal of Differential Equations. 2008;245:2078 - 2102. doi:http://dx.doi.org/10.1016/j.jde.2008.07.016. .
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J. Differential Equations. 2008;245:2078–2102. doi:10.1016/j.jde.2008.07.016. .
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Systems Control Lett. 2008;57:546–553. doi:10.1016/j.sysconle.2007.12.001. .
2007
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Vietnam J. Math. 2007;35:339–372. .
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Acta Math. Vietnam. 2007;32:99–111. .
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Stoch. Dyn. 2007;7:229–245. doi:10.1142/S0219493707002013. .
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J. Math. Anal. Appl. 2007;331:1159–1174. doi:10.1016/j.jmaa.2006.09.033. .