@article{EJDE_2009__2009__a159,
     author = {Cavani,  Mario and Lara,  Teodoro and Romero,  Sael},
     title = {Hopf bifurcation for simple food chain model with delay},
     journal = {Electronic journal of differential equations},
     year = {2009},
     volume = {2009},
     zbl = {1176.34099},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a159/}
}