@article{10_4064_ap_29_2_199_206,
     author = {K. Urbanik},
     title = {Remarks on the concept of mean value},
     journal = {Annales Polonici Mathematici},
     pages = {199--206},
     publisher = {mathdoc},
     volume = {29},
     number = {2},
     year = {1974},
     doi = {10.4064/ap-29-2-199-206},
     language = {en},
     url = {http://geodesic.mathdoc.fr/articles/10.4064/ap-29-2-199-206/}
}