@article{10_14708_cm_v23i2_6067,
     author = {M. Sinharoy},
     title = {Remarks on {Darboux} and {Mean} value properties of approximate derivatives},
     journal = {Commentationes Mathematicae},
     pages = { 315--324},
     publisher = {mathdoc},
     volume = {23},
     number = {2},
     year = {1983},
     doi = {10.14708/cm.v23i2.6067},
     language = {pl},
     url = {http://geodesic.mathdoc.fr/articles/10.14708/cm.v23i2.6067/}
}