@article{AM2_1978__18_136780,
     author = {B.P. Duggal},
     title = {Functional equations and linear transformations - permutability and inversion. {(Short} {Communication).}},
     journal = {Aequationes mathematicae},
     pages = {259--265},
     publisher = {mathdoc},
     volume = {18},
     year = {1978},
     zbl = {0414.47037},
     url = {http://geodesic.mathdoc.fr/item/AM2_1978__18_136780/}
}