@article{10_4153_CMB_1987_032_8,
     author = {Bullen, P. S. and Sarkhel, D. N.},
     title = {On {Darboux} and {Mean} {Value} {Properties}},
     journal = {Canadian mathematical bulletin},
     pages = {223--230},
     year = {1987},
     volume = {30},
     number = {2},
     doi = {10.4153/CMB-1987-032-8},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-1987-032-8/}
}