@article{AM2_1989__37_2-3_137301,
     author = {B. Forte and W. Hughes},
     title = {A representation theorem for entropies with the branching property.},
     journal = {Aequationes mathematicae},
     pages = {219--232},
     publisher = {mathdoc},
     volume = {37},
     number = {2-3},
     year = {1989},
     zbl = {0682.94007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1989__37_2-3_137301/}
}