@article{NSJOM_2008_38_2a_7,
     author = {R. Almeida},
     title = {A mean value theorem for internal functions and an

 estimation for the differential mean point},
     journal = {Novi Sad Journal of Mathematics},
     pages = {57-64},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {2008},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_2008_38_2a_7/}
}