Xingping Sun, V. A. Menegatto. Strictly positive definite functions on the complex Hilbert sphere. Adv. Comput. Math., 11(2-3):105-119, 1999. [doi]
@article{SunM99,
title = {Strictly positive definite functions on the complex Hilbert sphere},
author = {Xingping Sun and V. A. Menegatto},
year = {1999},
doi = {10.1023/A:1018915723982},
url = {http://dx.doi.org/10.1023/A:1018915723982},
researchr = {https://researchr.org/publication/SunM99},
cites = {0},
citedby = {0},
journal = {Adv. Comput. Math.},
volume = {11},
number = {2-3},
pages = {105-119},
}