@article{AM2_1974__11_136430,
     author = {Halina Swiatak and Bohdan Lawruk},
     title = {On {Functions} {Satisfying} a {Generalized} {Mean} {Value} {Equation.}},
     journal = {Aequationes mathematicae},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {11},
     year = {1974},
     zbl = {0291.39007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1974__11_136430/}
}