Strictly positive definite multivariate covariance functions on spheres. - Jean Carlo Guella; Valdir Antonio Menegatto; Emilio Porcu (J. Multivar. Anal., 2018)

Strictly positive definite non-isotropic kernels on two-point homogeneous manifolds: The asymptotic approach. - Jean Carlo Guella; Janin Jäger (CoRR, 2022)

On Gaussian kernels on Hilbert spaces and kernels on hyperbolic spaces. - Jean Carlo Guella (J. Approx. Theory, 2022)

Strictly positive definite kernels on compact Riemannian manifolds. - Jean Carlo Guella; Janin Jäger (CoRR, 2023)