@article{EJDE_1993__1993_4_a0,
     author = {Groetsch, C.W. and Scherzer, O.},
     title = {Optimal order of convergence for stable evaluation of differential operators},
     journal = {Electronic Journal of Differential Equations},
     publisher = {mathdoc},
     volume = {1993},
     number = {4},
     year = {1993},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/EJDE_1993__1993_4_a0/}
}