@article{MET_1989__36_3-4_176253,
     author = {A. Jalali-Naini and A.J. Watkins},
     title = {On a {Class} of {Three} {Dimensional} {Radially} {Symmetric} {Positive} {Definite} {Functions.}},
     journal = {Metrika},
     pages = {327--330},
     publisher = {mathdoc},
     volume = {36},
     number = {3-4},
     year = {1989},
     zbl = {0694.42019},
     url = {http://geodesic.mathdoc.fr/item/MET_1989__36_3-4_176253/}
}