%0 Journal Article %T Stability and Bifurcation Analysis in A SEIR Epidemic Model with Nonlinear Incidence Rates %A Changjin Xu %A Maoxin liao %J IAENG International Journal of Applied Mathematics %D 2011 %I International Association of Engineers (IAENG) %U http://www.iaeng.org/IJAM/issues_v41/issue_3/IJAM_41_3_03.pdf