@article{10_4064_am36_3_7,
     author = {Radouane Yafia},
     title = {The effect of time delay and {Hopf} bifurcation
 in a tumor-immune system competition model
 with negative immune response},
     journal = {Applicationes Mathematicae},
     pages = {349--364},
     publisher = {mathdoc},
     volume = {36},
     number = {3},
     year = {2009},
     doi = {10.4064/am36-3-7},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/am36-3-7/}
}