@article{CMFD_2012_45_a2,
     author = {Xiang-Sheng Wang and Jianhong Wu},
     title = {Periodic systems of delay differential equations and avian influenza dynamics},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {32--42},
     publisher = {mathdoc},
     volume = {45},
     year = {2012},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2012_45_a2/}
}