@article{EJDE_2009__2009__a9,
     author = {Anderson,  Douglas R.},
     title = {Oscillation and nonoscillation criteria for two-dimensional time-scale systems of first-order nonlinear dynamic equations},
     journal = {Electronic journal of differential equations},
     year = {2009},
     volume = {2009},
     zbl = {1185.34140},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_2009__2009__a9/}
}