@article{AM2_1974__11_136435,
     author = {R.T. Bumby},
     title = {On a {Problem} of {D'Atri} and {Nickerson.}},
     journal = {Aequationes mathematicae},
     pages = {57--67},
     publisher = {mathdoc},
     volume = {11},
     year = {1974},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/AM2_1974__11_136435/}
}