@article{MAN_1978__237_182793,
     author = {B.P. Duggal},
     title = {Functional {Equations} and {Linear} {Transformations.} {IV.} {Interpolation.}},
     journal = {Mathematische Annalen},
     pages = {277--286},
     publisher = {mathdoc},
     volume = {237},
     year = {1978},
     zbl = {0383.47032},
     url = {http://geodesic.mathdoc.fr/item/MAN_1978__237_182793/}
}