@article{10_1007_s10492_013_0034_2,
     author = {Lin, Xiaojie and Du, Zengji and Lv, Yansen},
     title = {Periodic solution to a multispecies predator-prey competition dynamic system with {Beddington-DeAngelis} functional response and time delay},
     journal = {Applications of Mathematics},
     pages = {673--687},
     publisher = {mathdoc},
     volume = {58},
     number = {6},
     year = {2013},
     doi = {10.1007/s10492-013-0034-2},
     mrnumber = {3162754},
     zbl = {06312921},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.1007/s10492-013-0034-2/}
}