@article{AM2_1988__35_2-3_137257,
     author = {Penntti Haukkanen},
     title = {A generalization of the {Subbarao} identity.},
     journal = {Aequationes mathematicae},
     pages = {76--81},
     publisher = {mathdoc},
     volume = {35},
     number = {2-3},
     year = {1988},
     zbl = {0696.10008},
     url = {http://geodesic.mathdoc.fr/item/AM2_1988__35_2-3_137257/}
}