@article{ETNA_2007__27__a7,
     author = {Kaymak\c{c}alan, B. and Zafer, A.},
     title = {Langenhop's inequality and applications for dynamic equations},
     journal = {Electronic transactions on numerical analysis},
     pages = {71--77},
     publisher = {mathdoc},
     volume = {27},
     year = {2007},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/ETNA_2007__27__a7/}
}