@article{PORMA_2000__57_3_48913,
     author = {Zhang, Fengqin and Zhao, Aimin and Yan, Yurang},
     title = {Monotone iterative method for differential equations with piecewise constant arguments.},
     journal = {Portugaliae mathematica},
     pages = {345--353},
     publisher = {mathdoc},
     volume = {57},
     number = {3},
     year = {2000},
     zbl = {0970.34060},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PORMA_2000__57_3_48913/}
}