%0 Journal Article %T Effect of Delay on Selection Dynamics in Long-Term Sphere Culture of Cancer Stem Cells %A Peng Tang %A Aijun Fan %A Jianquan Li %A Jun Jiang %J Discrete Dynamics in Nature and Society %D 2013 %I Hindawi Publishing Corporation %R 10.1155/2013/606250 %U http://dx.doi.org/10.1155/2013/606250